Re: Salaries and gender

Include in your list of references on salary differences and gender the article by M. H. Birnbaum, Relationships among models of salary bias, American Psychologist, 1985, July, 862-866. ~~~ Karl L. Wuensch, Department of Psychology, East Carolina Universi

Re: Double mediation

Sylvia J. Hysong, Ph.D. <[EMAIL PROTECTED]> wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > Hello, > > I'm hoping someone can help me with this. I have looked at a > multitude of resources including the David Kenny page, this and other > newsgroups, Pedhazur (1982), Cohen & Cohen

Re: "Normalizing" a non-normal distribution

Brian MacDonald wrote: > > I am doing a series of analyses using discriminant analysis to predict group > membership. Several of the variables I am using show distributions that are > not normal. My question is can these (and for that matter shold they) be > somehow transformed so that the resu

Re: How to calculate on-line the SD of a population?

Luigi Bianchi wrote in message <9i2doj$r61$[EMAIL PROTECTED]>... >Hi to all, it's the first time that I post to this NG, so I hope it is the >right place. >I have the following problem: I read data from an A/D board and I have to >provide an estimation of the SD of the population on-line, that is

Re: How calculate 95%=1.96 stdv

[EMAIL PROTECTED] (John Uebersax) wrote: > Both the PHI() and probit() functions are well approximated in > simple applications (such as calculating confidence intervals) > by simple polynomial formulas of a few terms. Some of these > take as few as 2 or 3 lines of code. You can find an approxi

Re: How calculate 95%=1.96 stdv

Hi Stefan, "s.petersson" <[EMAIL PROTECTED]> wrote in message news:... > Let's say I want to calculate this constant with a security level of > 93.4563, how do I do that? Basically I want to "unfold" a function like > this: > > f(95)=1.96 > > Where I can replace

Re: How calculate 95%=1.96 stdv

Dear Stefan, you should use this formula: (1) y = exp(-1/2*sqr(Z))/sqrt(2*3,1415) y is alfa value. For example: If you use Z=1,645 in (1) you will obtain y=0,10 or 0,90 confidence level. Respectfully, Alexandre Moura. Forgive me my English mistakes. - Original Message - From: "s.p

Re: How calculate 95%=1.96 stdv

At 01:11 PM 7/4/01 +, s.petersson wrote: >Hi NG, > >I sometimes run into a constant of 1.96 stdv that is used to calculate 95% >statistical confidence intervals. But I can't seem to find how the 1.96 stdv >is actually derived from a security level of 95%. In the statistical >textbooks I've rea

Re: Marijuana

On Sun, 01 Jul 2001 17:05:52 GMT, [EMAIL PROTECTED] (John R Ramsden) sat on a tribble, which squeaked: >One clever use for GPFs in an old OS called Primos (anyone >remember that?) was to detect kernel stack overflows. The >idea was that you positioned the stack in virtual address >space so that i

Re: cigs & figs

right wing conspiracy" he seems to be railing about. What Mr. Ulrich doesn't know is she was not only a lifelong smoker, but a Democratic Party activist as well. As yet, Mr. Ulrich has not provided the case law attributed to the two Justices re: smoking "rights" vis a vis

Re: How calculate 95%=1.96 stdv

s.petersson <[EMAIL PROTECTED]> wrote: > I sometimes run into a constant of 1.96 stdv that is used to calculate 95% > statistical confidence intervals. But I can't seem to find how the 1.96 stdv > is actually derived from a security level of 95%. In the statistical > textbooks I've read, there is

Re: cigs & figs

>>> Actually, the word is "unalienable." reg - Original Message - From: Rich Ulrich <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Sunday, July 01, 2001 7:08 PM Subject: Re: cigs & figs > - in respect of the up-coming U.S. holiday - > > On M

Re: cigs & figs

Actually, the word is "unalienable." reg - Original Message - From: Rich Ulrich <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Sunday, July 01, 2001 7:08 PM Subject: Re: cigs & figs > - in respect of the up-coming U.S. holiday - > > On Mon,

Re: cigs & figs

- in respect of the up-coming U.S. holiday - On Mon, 25 Jun 2001 11:49:47 GMT, mackeral@remove~this~first~yahoo.com (J. Williams) wrote: > On Sun, 24 Jun 2001 16:37:48 -0400, Rich Ulrich <[EMAIL PROTECTED]> > wrote: > > > >What rights are denied to smokers? JW > > Many smokers, including m

Re: about a problem of khi2 test

On Sun, 01 Jul 2001 14:19:31 +0200, Bruno Facon <[EMAIL PROTECTED]> wrote: > I work in the area of intelligence differentiation. I would like to know > how to use the khi2 statistic to determine whether the number of > statistically different correlations between two groups is due or not to > rand

Re: levene

At 01:10 PM 7/2/01 -0600, Stab wrote: >whats the difference between a modified levene test, and a levene test. > >how do you do both of these tests in SAS >thanks whether you do the test using the deviations around the medians of the samples (modified) or the means of the samples (i think the or

Re: Do you known?

Monica De Stefani wrote: > > Hi, is there anybody known > Quade, D. (1976) . "Nonparametric partial correlation", Measurement in > the social Sciences. Edited by H.M. Blalock, Jr. Aldine Publishing > Company: Chicago, 369-398? > I would known how he calcolate Kendall's partial tau (presisely), >

Re: about a problem of khi 2

Dear Mr Rubin, Many thanks for your response. I think you have understand what is my problem. I agree with you. A multivariate test would be probably better. Perhaps can I use Lisrel since this software allows the possibility to compare to independant matrices of correlations. In this case, how ma

Re: about a problem of khi 2

In article <[EMAIL PROTECTED]>, Bruno Facon <[EMAIL PROTECTED]> wrote: >Dear Sir, >I work in the area of intelligence differentiation. I would like to know >how to use the khi2 statistic to determine whether the number of >statistically different correlations between two groups is due or not t

Re: Do you known?

In sci.stat.edu Monica De Stefani <[EMAIL PROTECTED]> wrote: > Hi, is there anybody known > Quade, D. (1976) . "Nonparametric partial correlation", Measurement in > the social Sciences. Edited by H.M. Blalock, Jr. Aldine Publishing > Company: Chicago, 369-398? > I would known how he calcolate Ken

Re: Marijuana

[EMAIL PROTECTED] (David C. Ullrich) wrote: > > > And yet he never made the connection that maybe Michael > > Caracena's code *is* the code in Windows that regularly GPFs... > > Um, no. In [1] I wasn't talking about the GPF's that we > see when Windows crashes. I forget the details, but > these ar

Re: Maximum Likelihood

On 28 Jun 2001 20:39:18 -0700, [EMAIL PROTECTED] (Mark W. Humphries) wrote: > Hi, > > Does anyone have references to a simple/intuitive introduction to Maximum > Log Likelihood methods. > References to algorithms would also be appreciated. > Look on the Internet. I used www.google.com to sear

Re: Maximum Likelihood

In article <[EMAIL PROTECTED]>, Mark W. Humphries <[EMAIL PROTECTED]> wrote: >Hi, >Does anyone have references to a simple/intuitive introduction to Maximum >Log Likelihood methods. >References to algorithms would also be appreciated. >Cheers, > Mark W. Humphries Any decent text on mathematica

Re: Marijuana

"Ellen Hertz" <[EMAIL PROTECTED]> wrote: > I think you need 8760*(number of subjects followed for a year) > assuming the 124 heart attacks were from more than one subject. If the data show that one subject suffered 124 heart attacks, then SOMEBODY'S been smoking marijuana for SURE. -- Ross P

Re: cigs & figs

"Jackson,P" wrote: > > The thing is, of course, in the case of the car accident survivors etc, in > each of those individual cases, we can usually gain some insight into what > contributed to the survival. It would be very interesting to similarly > discover the basis of the long lives of the ol

Re: Marijuana

Paul, I think you need 8760*(number of subjects followed for a year) assuming the 124 heart attacks were from more than one subject. Then you could do a test as to whether or not marijuana in a given hour is associated with heart attack in that hour. The hours for a fixed subject are not indepen

RE: cigs & figs

. > -Original Message- > From: Thom Baguley [mailto:[EMAIL PROTECTED]] > Sent: 26 June 2001 12:22 > To: [EMAIL PROTECTED] > Subject: Re: cigs & figs > > > "J. Williams" wrote: > > She maintained, in spite of the Surgeon General's report and other

Re: Edstat: I. J. Good and Walker

  dennis roberts wrote: At 06:08 PM 6/19/01 +, Jerry Dallal wrote: >Alex Yu wrote: > > > > In 1940 Helen M. Walker wrote an article in the journal of Educational > > Psychology regarding the concept degrees of freedom.  In 1970s, I. J. Good > > wrote something to criticize Walker's idea. I fo

Re: cigs & figs

"J. Williams" wrote: > She maintained, in spite of the Surgeon General's report and other > studies I quoted, that smoking doesn't "cause" cancer or heart > disease. Her proof was she and her sister (my aunt) both lived to be > over 90 and were chain smokers. She insisted there are other factors

Re: M/G/1 model

It's the Kendall notation A/B/C/D/E A interarrival time distribution M: exponential D: deterministic E: Erlang K G: General B Servive time distribution M: exponential D: deterministic E: Erlang K G: General C number of parallel servers D system capacity E queuing ru

Re: Help with stats please

On 24 Jun 2001 13:54:56 -0700, [EMAIL PROTECTED] (dennis roberts) wrote: > At 12:20 PM 6/24/01 -0700, Melady Preece wrote: > >Hi. I am teaching educational statistics for the first time, and although I > >can go on at length about complex statistical techniques, I find myself at a > >loss with t

Re: Help with stats please

Melady Preece wrote: > > Hi. I am teaching educational statistics for the first time, and although I > can go on at length about complex statistical techniques, I find myself at a > loss with this multiple choice question in my test bank. I understand why > the range of (b) is smaller than (a)

Re: Marijuana

On Mon, 25 Jun 2001 09:09:52 GMT, [EMAIL PROTECTED] (Graaagh the Mighty) wrote: >On Sun, 24 Jun 2001 14:39:06 GMT, [EMAIL PROTECTED] (David C. >Ullrich) sat on a tribble, which squeaked: > [1]>>That's one scary thing - in fact there are places in >>Windows95 where the system _regularly_ creates G

Re: cigs & figs

In article <[EMAIL PROTECTED]>, Rich Ulrich <[EMAIL PROTECTED]> wrote: > - re: some outstandingly confused thinking. Or writing. >On Sat, 23 Jun 2001 15:25:31 GMT, mackeral@remove~this~first~yahoo.com >(J. Williams) wrote: >[ snip; Slate reference, etcetera ] >&g

Re: Help with stats please

In article <006901c0fce2$d07c7640$[EMAIL PROTECTED]>, Melady Preece <[EMAIL PROTECTED]> wrote: >Hi. I am teaching educational statistics for the first time, and although I >can go on at length about complex statistical techniques, I find myself at a >loss with this multiple choice question in my

Re: a form of censoring I have not met before

Hi, Margaret. I've given some thought to your problem; here's a restatement of it, and a few thoughts. Recapitulating, in case I've misunderstood a small point or three, you have "a 3-factor experiment", by which I assume you mean a complete, balanced, crossed design: R(AxBxC) for observat

Re: cigs & figs

On Sun, 24 Jun 2001 16:37:48 -0400, Rich Ulrich <[EMAIL PROTECTED]> wrote: >What rights are denied to smokers? Many smokers, including my late mother, feel being unable to smoke on a commerical aircraft, sit anywhere in a restaurant, etc. were violation of her "rights." I don't agree as a no

Re: Marijuana

On Sun, 24 Jun 2001 14:39:06 GMT, [EMAIL PROTECTED] (David C. Ullrich) sat on a tribble, which squeaked: >That's one scary thing - in fact there are places in >Windows95 where the system _regularly_ creates GPF's; >something to do with thunking or something. > >But the scary thing about the quote

Re: Normality in Factor Analysis

Robert Ehrlich <[EMAIL PROTECTED]> wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > Calculation of eigenvalues and eigenvalues requires no assumption. > However evaluation of the results IMHO implicitly assumes at least a > unimodal distribution and reasonably homogeneous variance

Re: Help with stats please

On Sun, 24 Jun 2001, Melady Preece wrote in part: > I am teaching educational statistics for the first time, and although I > can go on at length about complex statistical techniques, I find myself > at a loss with this multiple choice question in my test bank. I > understand why the range of

Re: cigs & figs

- re: some outstandingly confused thinking. Or writing. On Sat, 23 Jun 2001 15:25:31 GMT, mackeral@remove~this~first~yahoo.com (J. Williams) wrote: [ snip; Slate reference, etcetera ] > ... My mother was 91 years > old when she died a year ago and chain smoked since her c

Re: Help with stats please

At 12:20 PM 6/24/01 -0700, Melady Preece wrote: >Hi. I am teaching educational statistics for the first time, and although I >can go on at length about complex statistical techniques, I find myself at a >loss with this multiple choice question in my test bank. I understand why >the range of (b)

Re: Marijuana

- I will delete most, and comment on a few points. Maybe further posts will delete the sci.stat.* groups - On Fri, 22 Jun 2001 20:49:02 GMT, Steve Leibel <[EMAIL PROTECTED]> wrote: > In article <[EMAIL PROTECTED]>, > Rich Ulrich <[EMAIL PROTECTED]> wrote: > [ ... ] > > Hallucinating? On po

Re: Marijuana

On Sat, 23 Jun 2001 21:12:40 -0700, Chas F Brown <[EMAIL PROTECTED]> wrote: > > >"David C. Ullrich" wrote: >> [...] > >In the back-of-envelope calculations I did, this is really the key >missing information. If heart attacks are evenly distributed through the >day, while MJ smoking (as far as I

Re: Marijuana

On Sat, 23 Jun 2001 23:35:06 GMT, Tetsuo <[EMAIL PROTECTED]> wrote: >in article [EMAIL PROTECTED], Tetsuo at >[EMAIL PROTECTED] wrote on 24-06-2001 00:17: > >> in article [EMAIL PROTECTED], David C. Ullrich at >> [EMAIL PROTECTED] wrote on 23-06-2001 16:06: >> >>[obvious jokes' >[explanation of

Re: Marijuana

Damnit, I promised I wouldn't get involved in this absurd and off-topic thread, but I've got to set the record straight here: In article <[EMAIL PROTECTED]>, Tetsuo <[EMAIL PROTECTED]> wrote: >Normal pot doesn't cause hallucinations, exceptions have to be made with >allergies towards it, or not

Re: Marijuana

"David C. Ullrich" wrote: > > On Thu, 21 Jun 2001 21:14:44 -0700, Chas F Brown > <[EMAIL PROTECTED]> wrote: > > > > >That seems to be the type of correlation that was reported here - some > >distribution of MJ smoking, and its *temporal* correlation with heart > >attacks. > > > >Now, that s

Re: Marijuana

"David C. Ullrich" wrote: > > > I wonder if there's any data about correlation between alcohol > use and traffic fatalities? Probably not, I certainly don't see > why there would be any connection. I mean if alcohol were > more dangerous than pot in just about any way a person could > name t

Re: Marijuana

in article [EMAIL PROTECTED], Tetsuo at [EMAIL PROTECTED] wrote on 24-06-2001 00:17: > in article [EMAIL PROTECTED], David C. Ullrich at > [EMAIL PROTECTED] wrote on 23-06-2001 16:06: > >> On Fri, 22 Jun 2001 20:49:02 GMT, Steve Leibel <[EMAIL PROTECTED]> >> wrote: > >>> Hallucinating? On pot?

Re: Marijuana

in article [EMAIL PROTECTED], David C. Ullrich at [EMAIL PROTECTED] wrote on 23-06-2001 16:06: > On Fri, 22 Jun 2001 20:49:02 GMT, Steve Leibel <[EMAIL PROTECTED]> > wrote: >> Hallucinating? On pot? What are YOU smokin'? Pot doesn't cause >> hallucinations > > Where are you getting your fac

Re: probability that Xi >= X1...Xn

--20209B611F2A68F79DC95EE5 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit You say the X1...Xn are independent. Are they also identically distributed? If not, you will have some very cumbersome expressions.If we use f(Xk) as the density and F(Xk) as the cdf

Re: cigs & figs

On 17 Jun 2001 14:47:14 GMT, [EMAIL PROTECTED] (EugeneGall) wrote: >On Slate, there is quite a good discussion of the meaning and probabilistic >basis of the statement that 1 in 3 teen smokers will die of cancer. It is >written by a math prof and it is one of the most effective lay discussions I

Re: Marijuana

On Fri, 22 Jun 2001 20:49:02 GMT, Steve Leibel <[EMAIL PROTECTED]> wrote: >In article <[EMAIL PROTECTED]>, > Rich Ulrich <[EMAIL PROTECTED]> wrote: > >> On Fri, 22 Jun 2001 18:45:52 GMT, Steve Leibel <[EMAIL PROTECTED]> >> wrote: >> >> > In article <[EMAIL PROTECTED]>, >> > [EMAIL PROTECTED] (E

Re: Normality in Factor Analysis

In article <[EMAIL PROTECTED]>, Robert Ehrlich <[EMAIL PROTECTED]> wrote: >Calculation of eigenvalues and eigenvalues requires no assumption. >However evaluation of the results IMHO implicitly assumes at least a >unimodal distribution and reasonably homogeneous variance for the same >reasons as A

Re: trimming data

"dennis roberts" <[EMAIL PROTECTED]> wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... ... > keep in mind that if the data set is symmetrical ... then, trimming really > accomplishes nothing ... when it comes to the mean ... even if there are > extreme values ... This isn't quite co

Re: Marijuana

In article <[EMAIL PROTECTED]>, Rich Ulrich <[EMAIL PROTECTED]> wrote: > On Fri, 22 Jun 2001 18:45:52 GMT, Steve Leibel <[EMAIL PROTECTED]> > wrote: > > > In article <[EMAIL PROTECTED]>, > > [EMAIL PROTECTED] (Eamon) wrote: > > > > > (c) Reduced motor co-ordination, e.g. when driving a car >

Re: Normality in Factor Analysis

Calculation of eigenvalues and eigenvalues requires no assumption. However evaluation of the results IMHO implicitly assumes at least a unimodal distribution and reasonably homogeneous variance for the same reasons as ANOVA or regression. So think of th consequencesof calculating means and varian

Re: Marijuana

On Fri, 22 Jun 2001 18:45:52 GMT, Steve Leibel <[EMAIL PROTECTED]> wrote: > In article <[EMAIL PROTECTED]>, > [EMAIL PROTECTED] (Eamon) wrote: > > > (c) Reduced motor co-ordination, e.g. when driving a car > > > > Numerous studies have shown that marijuana actually improves driving > ability

Re: Marijuana

In article <[EMAIL PROTECTED]>, [EMAIL PROTECTED] (Eamon) wrote: > (c) Reduced motor co-ordination, e.g. when driving a car > Numerous studies have shown that marijuana actually improves driving ability. It makes people more attentive and less aggressive. You could look it up. ==

Re: Marijuana

Paul Jones <[EMAIL PROTECTED]> wrote in message news:<[EMAIL PROTECTED]>... > There was some research recently linking heart attacks with > Marijuana smoking. > > I'm trying to work out the correlation and, most > importantly, its statistical significance. > > In essence the problem comes down

Re: calculation of an effect size with medians

Marc wrote: > > As a part of a report > I have to perform a meta-analysis of > some clinical trials. > These trials report the median effect in the > treatment group and the median effect in the control group > (days of hospitalization). P-values from Mann-Whitney U-Tests > are reported and the n

Re: Marijuana

On Thu, 21 Jun 2001 21:14:44 -0700, Chas F Brown <[EMAIL PROTECTED]> wrote: > > >"David C. Ullrich" wrote: >> >> On Fri, 15 Jun 2001 15:23:03 +0100, Paul Jones >> <[EMAIL PROTECTED]> wrote: >> >> >"David C. Ullrich" wrote: >> >> >> >> But analyzing it this way simply makes no sense. Those >> >>

Re: Marijuana

"David C. Ullrich" wrote: > > On Fri, 15 Jun 2001 15:23:03 +0100, Paul Jones > <[EMAIL PROTECTED]> wrote: > > >"David C. Ullrich" wrote: > >> > >> But analyzing it this way simply makes no sense. Those > >> "trials" you're talking about are _far_ from independent; > >> each "trial" is associat

Re: a form of censoring I have not met before

On 21 Jun 2001 00:35:11 -0700, [EMAIL PROTECTED] (Margaret Mackisack) wrote: > I was wondering if anyone could direct me to a reference about the > following situation. In a 3-factor experiment, measurements of a continuous > variable, which is increasing monotonically over time, are made every

Re: Marijuana

On Fri, 15 Jun 2001 15:23:03 +0100, Paul Jones <[EMAIL PROTECTED]> wrote: >"David C. Ullrich" wrote: >> >> But analyzing it this way simply makes no sense. Those >> "trials" you're talking about are _far_ from independent; >> each "trial" is associated with a particular person, and >> there will

Re: comparing 2 slopes

in article [EMAIL PROTECTED], Tracey Continelli at [EMAIL PROTECTED] wrote on 6/20/01 7:06 AM: > "mccovey@psych" <[EMAIL PROTECTED]> wrote in message > news:<[EMAIL PROTECTED]>... >> in article [EMAIL PROTECTED], Tracey >> Continelli at [EMAIL PROTECTED] wrote on 6/13/01 4:14 PM: >> >>> "Mike To

Re: trimming data

in article [EMAIL PROTECTED], Mike Granaas at [EMAIL PROTECTED] wrote on 6/20/01 10:56 AM: > > A colleague has approached me about locating references discussing the > trimming of data, with primary emphasis on psychological research. He is > primarily interested in books/chapters/articles that

Re: trimming data

here is some help info from minitab about trimmed means ... === Trimmed mean The trimmed mean (TrMean) is like the mean, but it excludes the most extreme values in the data set. The highest and lowest 5% of the values (rounded to the nearest integer) are dropped, and the mean is calculate

Re: trimming data

At 11:24 AM 6/20/01 -0500, Mike Granaas wrote: >A colleague has approached me about locating references discussing the >trimming of data, with primary emphasis on psychological research. He is >primarily interested in books/chapters/articles that emphasize the when >and how. > >I am at a loss on

Re: Consistency quotation

able man! And I can't think why! ..." reg - Original Message - From: "Robert J. MacG. Dawson" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Cc: <[EMAIL PROTECTED]> Sent: Tuesday, June 19, 2001 8:52 PM Subject: Re: Consistency quotation > >

Re: comparing 2 slopes

"mccovey@psych" <[EMAIL PROTECTED]> wrote in message news:<[EMAIL PROTECTED]>... > in article [EMAIL PROTECTED], Tracey > Continelli at [EMAIL PROTECTED] wrote on 6/13/01 4:14 PM: > > > "Mike Tonkovich" <[EMAIL PROTECTED]> wrote in message > > news:<3b20f210_1@newsfeeds>... > >> Was hoping someo

Re: Consistency quotation

"Robert J. MacG. Dawson" burbled: > No, the King in Gilbert (and Sulivan's) "Utopia Unlimited". Or possibly > the "Grand Duke"? After a moment's thought, I realize it was neither. It's from the other G&S I've never actually seen performed (if you discount their very obscure fir

Re: Consistency quotation

Jay Warner wrote: > > G. B. Shaw - Pygmaillion (sp) > > My Fair Lady, maybe too. > > "I can tell a woman's age in half a minute - and I do." Surely H. > Higgins prided himself on consistency :) No, the King in Gilbert (and Sulivan's) "Utopia Unlimited". Or possibly the "Grand Duke"?

Re: comparing 2 slopes

in article [EMAIL PROTECTED], Tracey Continelli at [EMAIL PROTECTED] wrote on 6/13/01 4:14 PM: > "Mike Tonkovich" <[EMAIL PROTECTED]> wrote in message > news:<3b20f210_1@newsfeeds>... >> Was hoping someone might be able to confirm that my approach for comparing 2 >> slopes was correct. >> >> I r

Re: 3rd degree polynom curve fitting, correlation needed

in article [EMAIL PROTECTED], Matti Overmark at [EMAIL PROTECTED] wrote on 6/18/01 7:10 AM: > Hi group! > > I´m new to this group, so...just you know. > > I have fitted a 3 rd degree curve to a sample (least square method), and > I want to compare this particular R2 with that of > a (similarily

Re: Marijuana

In response, http://www.drugwarfacts.org/causes.htm If you can find cites on mortality and morbidity for marijuana I would be very interested in forwarding this info to people with an axe to grind in either political camp. Scientific data doesn't seem to phase those in the US congress but hope

Re: Marijuana

"W. D. Allen Sr." wrote: > There is medical research that shows marijuana is more lethal than tobacco > regarding lung cancer. > > Maybe there is a correlation between lung cancer susceptibility and heart > attacks? We know there is for tobacco! We know there is a correlation between alcoho

Re: Edstat: I. J. Good and Walker

Shareef Siddeek wrote: > Anyway, what is the general, easy to understand, definition of df that could be > applied in any situation: chi-square test, ANOVA, linear and non-linear > multiparameter model fitting by least square, MLH method. etc.? This question is raised every few years. It's abou

Re: Consistency quotation

G. B. Shaw - Pygmaillion (sp) My Fair Lady, maybe too. "I can tell a woman's age in half a minute - and I do."  Surely H. Higgins prided himself on consistency :) Jay [EMAIL PROTECTED] wrote: I remember reading something like the following:    "Consistency alone is not necessarily a virtue.     O

Re: Help me, please!

On 18 Jun 2001 01:18:37 -0700, [EMAIL PROTECTED] (Monica De Stefani) wrote: > 1) Are there some conditions which I can apply normality to Kendall > tau? tau is *lumpy* in its distribution for N less than 10. And all rank-order statistics are a bit problematic when you try to use them on ratin

Re: Edstat: I. J. Good and Walker

Alex Yu wrote: > > In 1940 Helen M. Walker wrote an article in the journal of Educational > Psychology regarding the concept degrees of freedom. In 1970s, I. J. Good > wrote something to criticize Walker's idea. I forgot the citation. I tried > many databases and even searched the internet but g

Re: Edstat: I. J. Good and Walker

In article <[EMAIL PROTECTED]>, [EMAIL PROTECTED] (Alex Yu) wrote: #In 1940 Helen M. Walker wrote an article in the journal of Educational #Psychology regarding the concept degrees of freedom. In 1970s, I. J. Good #wrote something to criticize Walker's idea. I forgot the citation. I tried #man

Re: Help me, please!

In article <9gmcaa$75i$[EMAIL PROTECTED]>, "Glen Barnett" <[EMAIL PROTECTED]> wrote: > Monica De Stefani <[EMAIL PROTECTED]> wrote in message > [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > > 2) Can Kendall discover nonlinear dependence? > > He used to be able to, but he died. > > (Look at how

Re: Help me, please!

Monica De Stefani <[EMAIL PROTECTED]> wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > 2) Can Kendall discover nonlinear dependence? He used to be able to, but he died. (Look at how Kendall's tau is calculated. Notice that it is not affected by any monotonic increasing transforma

Maximum likelihood Was: Re: Factor Analysis

In article <[EMAIL PROTECTED]>, Ken Reed <[EMAIL PROTECTED]> wrote: >It's not really possible to explain this in lay person's terms. The >difference between principal factor analysis and common factor analysis is >roughly that PCA uses raw scores, whereas factor analysis uses scores >predicted fr

Re: Probability Of an Unknown Event

The problem comes because there is often no unique way of defining events. It is hard to think of a real example where we literally "know nothing". The "equal probability" answer is often just a cop-out for not thinking about what we do know.

Re: Probability Of an Unknown Event

On Sat, 16 Jun 2001 23:05:52 GMT, "W. D. Allen Sr." <[EMAIL PROTECTED]> wrote: > It's been years since I was in school so I do not remember if I have the > following statement correct. > > Pascal said that if we know absolutely nothing > about the probability of occurrence of an event >

Re: Probability Of an Unknown Event

Thanks Robert! WDA end - Original Message - From: "Robert J. MacG. Dawson" <[EMAIL PROTECTED]> To: "W. D. Allen Sr." <[EMAIL PROTECTED]> Cc: <[EMAIL PROTECTED]> Sent: Sunday, June 17, 2001 6:35 PM Subject: Re: Probability Of an Unknown

Re: 3rd degree polynom curve fitting, correlation needed

Matti Overmark wrote: > I have fitted a 3 rd degree curve to a sample (least square method), and > I want to compare this particular R2 with that of > a (similarily) fitted 2 degree polynom. I can assure you that the 3rd degree polynomial will fit as well or better than the 2nd degree polynomial

Re: Probability Of an Unknown Event

The only time I can think of this being meaningful is in determining what size sample to draw. If we don't have any prior information about what the proportion of events in a population have a particular characteristic (the probability of a characteristic), then we assume the worse-case (widest v

Re: multivariate techniques for large datasets

you might want to go to http://www.pitt.edu/~csna/ and then cross-post your question to CLASS-L The Classification Society meeting this weekend had a lot of discussion of these topics. My first question is whether you intend to interpret the clusters? If so, what is the nature of the 500 variab

Re: 3rd degree polynom curve fitting, correlation needed

Judd & McClelland, _Data Analysis: A Model Comparison Approch_, chapter 8. MG On 18 Jun 2001, Matti Overmark wrote: > Hi group! > > I´m new to this group, so...just you know. > > I have fitted a 3 rd degree curve to a sample (least square method), and > I want to compare this particular R2

Re: Probability Of an Unknown Event

"W. D. Allen Sr." wrote: > > It's been years since I was in school so I do not remember if I have the > following statement correct. > > Pascal said that if we know absolutely nothing > about the probability of occurrence of an event > then our best estimate for the probability of

Re: Factor Analysis

Ken Reed schrieb: > > It's not really possible to explain this in lay person's terms. The > difference between principal factor analysis and common factor analysis is > roughly that PCA uses raw scores, whereas factor analysis uses scores > predicted from the other variables and does not include

Re: Factor Analysis

racey Continelli) > Organization: http://groups.google.com/ > Newsgroups: sci.stat.consult,sci.stat.edu,sci.stat.math > Date: 15 Jun 2001 20:26:48 -0700 > Subject: Re: Factor Analysis > > Hi there, > > would someone please explain in lay person's terms the difference >

Re: individual item analysis

On 15 Jun 2001 14:24:39 -0700, [EMAIL PROTECTED] (Doug Sawyer) wrote: > I am trying to locate a journal article or textbook that addresses > whether or not exam quesitons can be normalized, when the questions are > grouped differently. For example, could a question bank be developed > where any

Re: meta-analysis

On 17 Jun 2001, Marc wrote (edited): > I have to summarize the results of some clinical trials. > The information given in the trials contain: > > Mean effects (days of hospitalization) in treatment & control groups; > numbers of patients in the groups; p-values of a t-test (of the > differen

Re: meta-analysis

On 17 Jun 2001 04:34:26 -0700, [EMAIL PROTECTED] (Marc) wrote: > I have to summarize the results of some clinical trials. > Unfortunately the reported information is not complete. > The information given in the trials contain: > > (1) Mean effect in the treatment group (days of hospitalization)

Re: Marijuana

On 15 Jun 2001 02:04:36 -0700, [EMAIL PROTECTED] (Eamon) wrote: [ snip, Paul Jones. About marijuana statistics.] > > Surely this whole research is based upon a false premise. Isn't it > like saying that 90%, say, of heroin users previously used soft drugs. > Therefore, soft-drug use usually le

Re: Normality in Factor Analysis

In article <9gg7ht$qa3$[EMAIL PROTECTED]>, haytham siala <[EMAIL PROTECTED]> wrote: >Hi, >I have a question regarding factor analysis: Is normality an important >precondition for using factor analysis? >If no, are there any books that justify this. Factor analysis is quite robust against non-no

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