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URGENT BUSINESS PROPOSAL This letter may come to you as a surprise since it is coming from someone you have not met before. However, we decided to contact you based on a satisfactory information we had about your business person as regard business information concerning your country and the s

VENTURE CAPITAL

FROM:MALIK MADAKI URGENT BUSINESS PROPOSAL This letter may come to you as a surprise since it is coming from Someone you have not met before. However, we decided to contact you based on a satisfactory information we had about your business person as regard business information concerning your

Re: Teaching Intro Biostat using Daniel's book

I'm using Daniel's book too. I've used it for the last couple of years, switching from Glantz Primer. The 7th edition still has quite a few errors, but I like it for some of the exercises. Would love to be on your mailing list. Warren [EMAIL PROTECTED] (Robert Hamer) wrote in message news:<9l

RE: Bimodal distributions

At 01:22 PM 8/30/01 -0500, Paul R. Swank wrote: >A bomodal distibution is often thought to be a mixture of two other >distibution with different modes. If the distributions have different sizes, >then it is possible to have two or more "humps". I once read somewhere (and >now can't remember where)

Re: Bimodal distributions

At 02:04 PM 8/30/01 -0400, David C. Howell wrote: >Karl Wuensch asks an interesting question, though I would phrase it >somewhat more generally. "At what point does a bimodal distribution become >just a distribution with two peaks?" or allow me to rephrase as ... when are there enough frequenc

outliers (was MCAS)

At 9:41 AM -0400 8/30/01, Dennis Roberts wrote: >all of this is assuming of course, that some extreme value ... by ANY >definition ... is "bad" in some way ... that is, worthy of special >attention for fear that it got there by some nefarious method > >i am not sure the flagging of extreme values

RE: Bimodal distributions

A bomodal distibution is often thought to be a mixture of two other distibution with different modes. If the distributions have different sizes, then it is possible to have two or more "humps". I once read somewhere (and now can't remember where) that this may be referred to as bimodal (or multimo

Re: Bimodal distributions

Karl Wuensch asks an interesting question, though I would phrase it somewhat more generally. "At what point does a bimodal distribution become just a distribution with two peaks?"  Except for a few quite extreme situations, dealing with mixtures of distributions and the like, it will rarely ever b

Re: Bimodal distributions

hi karl ... i think the answer is yes ... if you want it to have 2 modes the mode is a problematical statistic ... since there is no good definition for it and ... a few frequencies shifting around ... could radically change the "mode" or "modes" in minitab, there is no place where ANY mode is

Conditional or not, which is the appropriate, and how can I performe?

Hello, I have performed a case-controlled study about the risk factors for breasr cancer in Turkey. There were 500 hundred cases and 500 hundred controls. The age of the cases and controls were the same, that is, there were the same cases and controls in age of 35, 37, 45 etc.Dependent variable w

Bimodal distributions

Does a bimodal distribution necessarily have two modes? This might seem like a silly question, but in my experience many folks apply the term "bimodal" whenever the PDF has two peaks that are not very close to one another, even if the one peak is much lower than the other. For example, D

RE: Boston Globe: MCAS results show weakness in teens' grasp of

Donald Burrill wrote: >If the data are normally distributed (or even approximately so, what >seems to be called "empirically distributed" these days), the 3rd >quartile + 1.5 IQR locates a point 2.0 std. devs. above the mean; >symmetrically, the 1st quartile minus 1.5 IQR gets you 2.0 SDs belo

doxplots

speaking of combining info from a dotplot and a boxplot ... which i want to dub ... DOXPLOT ...minitab does have a macro file ... called %describe ... that shows the histogram of a distribution and below it, the boxplot ... one example is at http://roberts.ed.psu.edu/users/droberts/introstat/d

Re: Boston Globe: MCAS results show weakness in teens' grasp of

all of this is assuming of course, that some extreme value ... by ANY definition ... is "bad" in some way ... that is, worthy of special attention for fear that it got there by some nefarious method i am not sure the flagging of extreme values has any particular value ... certainly, to flag an

RE: Factor analysis - which package is best for Windows?

Also check out R, a GNU implementation of the S language, most prominently known through its use in S-Plus. R is a fully featured statisitical programming environment. In its MVA (Multivariate) package, it includes routines for factor analysis using maximum liklihood estimation with varimax and

Re: Boston Globe: MCAS results show weakness in teens' grasp of

I wrote: > Er, no. > > Q1 ~ mu - 2/3 sigma > Q3 ~ mu + 2/3 sigma > 1 IQR ~ 4/3 sigma > 1.5 IQR ~ 2 sigma > > inner fence ~ mu +- 2 2/3 sigma which is about the 0.5 percentile. -right so far - and then burbled > The inner fences are s

Re: Boston Globe: MCAS results show weakness in teens' grasp of

Donald Burrill wrote: > > On Tue, 28 Aug 2001, Dennis Roberts wrote in part: > > > however ... the "flagging" of "outliers" is totally arbitrary ... i > > see no rationale for saying that if a data point is 1.5 IQRs away from > > some point ... that there is something significant about that >

Re: Factor analysis - which package is best for Windows?

I have tried it and it is amazing. A bargain ;) "Richard Wright" <[EMAIL PROTECTED]> wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > KyPlot runs under Windows, is freeware and gives you several factor > analysis algorithms to choose from. > > http://www.rocketdownload.com/Details