I will be working with analysis of salary differences in a gender
perspective in my university, and I would like to know if anyone out
there has been doing anything similar. What I wonder is what are the
mechanisms that drive salary differences and how to detect them
and model them
Hello,
I'm the Systems Administrator that works with Owner of the EDSTAT LIST. I
hope that the transition of the EDSTAT list and all of the memberships went
fairly smoothly. Basically we have move the mail portion of the list to a new
server, which will **NOT** allow for attachments and
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
Anonymous God-fearer [EMAIL PROTECTED] wrote:
Does anyone know how to generate a correlation matrix given a covariance
matrix in Splus?
Or could you give the details of how to do it in another language?
corr[i,j] = cov[i,j]/sqrt(cov[i,i]*cov[j,j])
On 28 Feb 2002 07:37:16 -0800, [EMAIL PROTECTED] (Brad Anderson)
wrote:
Rich Ulrich [EMAIL PROTECTED] wrote in message
news:[EMAIL PROTECTED]...
On 27 Feb 2002 11:59:53 -0800, [EMAIL PROTECTED] (Brad Anderson)
wrote:
BA
I have a continuous response variable that ranges from 0 to
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Hi All,
How reliable is Dunnett's comparison (w/control) when
applied to ranked data ? This appears to be an ad hoc
nonparametric multiple comparison with a test
statistic based on group rank sums in place of group
means and a standard error of sqrt[n(np)(np+1))/6]
My guess is that it's
Does anyone know how to generate a correlation matrix given a covariance
matrix in Splus?
Or could you give the details of how to do it in another language?
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Instructions for joining and leaving this list, remarks about the
Dr Jonathan Newman wrote:
I'm trying to find a good introduction to REML (restricted maximum
likelihood). I'm a biologist rather than a statistician. If you have any
suggestions I'd great appreciate hearing them. Thanks.
Lynch Walsh (1998)? (Genetic Analysis of Quantitative Traits,
What do i do if I need to run a factor analysis and have non-normal
distribution for some of the items (indicators)? Does Principal
component analysis require the normality assumption Can I use GLS to
extract the factors and get over the problem of non-normality Please
do give references if you
What is the correct pronunciation for Akaike as in AIC?
Thanks,
SR Millis (rhymes with bacillus)
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A good book is
Pinheiro, J.C. and Bates., D.M. mixed models with S and S-Plus,
Springer.
Kjetil Halvorsen
Dr Jonathan Newman wrote:
I'm trying to find a good introduction to REML (restricted maximum
likelihood). I'm a biologist rather than a statistician. If you have any
suggestions
But Mahalanobis distance is sensible to swamping and masking so is it really
a good measure for outliers?
DELOMBA a écrit dans le message ...
What about Hat Matrix ? Mahalanobis distance ?
Yves
Voltolini [EMAIL PROTECTED] wrote in message
Rolf Dalin [EMAIL PROTECTED] wrote:
Brad Anderson wrote:
I have a continuous response variable that ranges from 0 to 750. I only
have 90 observations and 26 are at the lower limit of 0,
What if you treated the information collected by that variable as really
two variables, one
The Enclyclopedia of Biostatistics (Armitage P, Colton T; Wiley,
1999?) has an article on REML.
I have not seen the article, but usually their articles well explain
statistical concepts to non-statisticians.
The Encyclopedia is a resource you might find helpful in general. For
more info, see:
[EMAIL PROTECTED] (Eric Bohlman) wrote in message
news:a5o5b1$fi0$[EMAIL PROTECTED]...
Rolf Dalin [EMAIL PROTECTED] wrote:
IIRC, your example is exactly the sort of situation for which Tobit
modelling was invented.
Considered that (actually estimated a couple of Tobit models and if I
use
On 1 Mar 2002 04:51:42 -0800, [EMAIL PROTECTED] (Mobile Survey)
wrote:
What do i do if I need to run a factor analysis and have non-normal
distribution for some of the items (indicators)? Does Principal
component analysis require the normality assumption.
There is no problem of
On 1 Mar 2002 00:36:01 -0800, [EMAIL PROTECTED] (Alex Yu)
wrote:
I know that robust regression can downweight outliers. Should someone
apply robust regression when the data have skewed distributions but do not
have outliers? Regression assumptions require normality of residuals, but
not
If, for example, normality assumption holds then by doing robust
regression instead of OLS you lose efficiency. So, it's not the same
result after all. But you can do both, compare and decide. If robust
regression produces results which are not really different from the OLS
then stay with OLS.
SR Millis wrote in message [EMAIL PROTECTED]...
What is the correct pronunciation for Akaike as in AIC?
Thanks,
SR Millis (rhymes with bacillus)
In Japanese, all letters are pronounced.
Try: Aka-ee-ke
Now try pronouncing Toyota! `y` is always a consonant in Japanese, so it
should be
to amplifiy a bit, the interpretability of regression tends to go down as
the assumptions of normality and homogeneous variance are markedly
different from reality. You can still go through the calcualtions but the
interpretation of results gets tricky. Factor analysis is a sort of
regression
Title: ADVLoans.com
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Has been a valuable forum for sharing and discussing with peers and other stakeholders
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In the Winter 2002 Quality Circle
I would consider it a unipolar extent scale Maybe the visual anchor should be
0 to 6 to aid association with the number line concept
Dennis Roberts wrote:
At 01:39 PM 2/27/02 -0600, Jay Warner wrote:
Not stressful 1__ 2__ 3__ 4__ 5__ 6__ 7__ Very stressful
just out of curiosity how
DMR, I should have read your previous posting more carefully I have now had
coffee
Not stressful 1__ 2__ 3__ 4__ 5__ 6__ 7__ Very stressful
is a question that has an extent response format The cognitive schema the
response format tries to invoke might be reinforced by anchoring with zero for
On 27 Feb 2002 15:01:24 -0800, [EMAIL PROTECTED] (Dennis Roberts) wrote:
At 01:39 PM 2/27/02 -0600, Jay Warner wrote:
Not stressful 1__ 2__ 3__ 4__ 5__ 6__ 7__ Very stressful
just out of curiosity ... how many consider the above to be an example of a
bipolar scale?
i don't
now, if we
Rich Ulrich [EMAIL PROTECTED] wrote in message
news:[EMAIL PROTECTED]...
On 27 Feb 2002 11:59:53 -0800, [EMAIL PROTECTED] (Brad Anderson)
wrote:
I have a continuous response variable that ranges from 0 to 750. I
only have 90 observations and 26 are at the lower limit of 0, which is
At 07:37 AM 2/28/02 -0800, Brad Anderson wrote:
I think a lot of folks just run standard analyses or arbitrarily apply
some normalizing transformation because that's whats done in their
field. Then report the results without really examining the
underlying distributions. I'm curious how folks
I'm trying to find a good introduction to REML (restricted maximum
likelihood). I'm a biologist rather than a statistician. If you have any
suggestions I'd great appreciate hearing them. Thanks.
--
Dr Jonathan Newman
St. Peter's College, New Inn Hall Street,
At 09:51 AM 2/28/02 -0800, Jay Tanzman wrote:
I partially did this, insofar as I ran Pearson and Spearman correlations
between
several of the scales and, not surprisingly, the two correlation coefficients
and their p-values were similar. that issue is entirely a separate
one since the rank
On 27 Feb 2002 14:14:44 -0800, [EMAIL PROTECTED] (Dennis Roberts) wrote:
At 04:11 PM 2/27/02 -0500, Rich Ulrich wrote:
Categorizing the values into a few categories labeled,
none, almost none, is one way to convert your scores.
If those labels do make sense.
well, if 750 has the
In article [EMAIL PROTECTED],
Glen [EMAIL PROTECTED] wrote:
Chia C Chong [EMAIL PROTECTED] wrote in message
news:a5g27d$e57$[EMAIL PROTECTED]...
Hi!
I have a set of random numbers and if I know their expectation/mean, would
it be possible to deduce a PDF to describe the distribution of them?
Title: ·ºÎ¢ÐͬÉÌÎñϵͳ
edstat-l£¬ÄúºÃ£¡
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I know that robust regression can downweight outliers Should someone
apply robust regression when the data have skewed distributions but do not
have outliers? Regression assumptions require normality of residuals, but
not the normality of raw scores So does it help at all to use robust
This is a multi-part message in MIME format.
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What about Hat Matrix ? Mahalanobis distance ?
Yves
Voltolini [EMAIL PROTECTED] wrote in message
00f301c1be68$13413000$fde9e3c8@oemcomputer">news:00f301c1be68$13413000$fde9e3c8@oemcomputer...
Hi,
I would like to know if methods for detecting outliers
using interquartil ranges are indicated
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That is either a sloppiness in writing or reliance on the relationship
between eigen decomposition and SVD.
SSM - square symmetric matrix
AM - arbitrary matrix
In ED, SSM = Q E Q'
In SVD, AM = P D Q'
SSM = AM' AM
= Q D P' P D Q' = Q D D Q'
= Q E Q', if E = D D
I haven't
Dear EdStat readers,
During the next week (probably Friday or Monday), the EdStat list will
move to a new server. At that time, we will also start using a new
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I have a continuous response variable that ranges from 0 to 750. I
only have 90 observations and 26 are at the lower limit of 0, which is
the modal category. The mean is about 60 and the median is 3; the
distribution is highly skewed, extremely kurtotic, etc. Obviously,
none of the power
At 04:11 PM 2/27/02 -0500, Rich Ulrich wrote:
Categorizing the values into a few categories labeled,
none, almost none, is one way to convert your scores.
If those labels do make sense.
well, if 750 has the same numerical sort of meaning as 0 (unit wise) ... in
terms of what is being
At 01:39 PM 2/27/02 -0600, Jay Warner wrote:
Not stressful 1__ 2__ 3__ 4__ 5__ 6__ 7__ Very stressful
just out of curiosity ... how many consider the above to be an example of a
bipolar scale?
i don't
now, if we had an item like:
sad happy
1 . 7
THEN the mid point
Good places to start:
Optimal feature extractors, that's better than PCA because you whiten your
inter class scatter and so put all inter class comparisons on the same
level. The good thing is this will also reduce your feature vector
dimensionality to c-1 (where c is # classes). PCA will not do
Corection typo: Should read 'Whiten intra class scatter'
Mark Harrison [EMAIL PROTECTED] wrote in message
news:FIif8.16518$[EMAIL PROTECTED];
Good places to start:
Optimal feature extractors, that's better than PCA because you whiten your
inter class scatter and so put all inter class
Brad Anderson wrote:
I have a continuous response variable that ranges from 0 to 750. I only
have 90 observations and 26 are at the lower limit of 0,
What if you treated the information collected by that variable as really
two variables, one categorical variable indicating zero or non-zero
Hi, thank you for reading this message. I have the following problems in
getting the correct CRIMCOORD transformation of categorical variables
in QUEST decision tree algorithm. Your help will be greatly appreciated.
Q1: In Loh Shih's paper (Split Selection Models for Classification
Trees,
In article [EMAIL PROTECTED],
Glen Barnett [EMAIL PROTECTED] wrote:
Herman Rubin wrote:
In article a5daqb$72k$[EMAIL PROTECTED],
Chia C Chong [EMAIL PROTECTED] wrote:
Hi!
Does anyone come across some Matlab code to estimate the parameters for the
Cauchy PDF?? Or some other sources about
In article 00f301c1be68$13413000$fde9e3c8@oemcomputer,
Voltolini [EMAIL PROTECTED] wrote:
Hi,
I would like to know if methods for detecting outliers
using interquartil ranges are indicated for data with
NON normal distribution.
The software Statistica presents this method:
data point value UBV
MAA PREP Workshop in Statistics for Summer 2002
An Introduction to Statistical Methods Based on Regression
Dates: June 2 through 7, 2002
Location: Oberlin College
Presenters:
Richard L. Scheaffer
Department of Statistics
University of Florida
Gainesville, FL 32611
Phone: 352-378-1996
Fax:
J. Williams wrote:
On Mon, 25 Feb 2002 15:17:55 -0800, Jay Tanzman [EMAIL PROTECTED]
wrote:
I just got chewed out by my boss for modelling the means of some 7-point
semantic differential scales. The scales were part of a written,
self-administered questionnaire, and were laid out like
2. Perhaps more likely, your boss may have learned
(wrongly?) that parametric stats should not be done unless scales
of measurement are at least interval in quality.
I don't know if his objection was to parametric statistics per se, but he did
object to calculating means on these
Hi,
I have a doubt about ordinal variables !
I understand that months (jan., feb., mar.) and level of aggression (low,
medium, high) can be accepted as qualitative ordinal variables but
my doubt is.
What about variables like seed size when using categories like small, medium
and
Title: Oº»¸ÞÀÏÀºÁ¤º¸Åë½Å¸ÁÀÌ¿ëÃËÁø¹×Á¤º¸º¸È£µî¿¡°üÇѹý·üÁ¦50Á¶¿¡ÀÇ°ÅÇÑ[±¤°í]¸ÞÀÏÀÔ´Ï´Ù
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Jay Tanzman wrote:
Jay Warner wrote:
Jay Tanzman wrote:
I just got chewed out by my boss for modelling the means of some 7-point
semantic differential scales. The scales were part of a written,
self-administered questionnaire, and were laid out like this:
Not stressful
Chia C Chong [EMAIL PROTECTED] wrote in message
news:a5g27d$e57$[EMAIL PROTECTED]...
Hi!
I have a set of random numbers and if I know their expectation/mean, would
it be possible to deduce a PDF to describe the distribution of them?
Knowing the mean tells you (almost) nothing about the
Odds are multiplicative in the following sense, useful in some types of
betting arrangements.
If the odds of one bet are 4 to 3 and of the next bet 3 to 2 then the odds
of both bets are the product 4*3 to 3*2 or 2 to 1. This is useful in some
horse racing bets where the second (and even more)
Hi,
I am trying to work out the expected value of a RV z. After some
manipulation, I end up with the following integral to
solve:
\int{zsin{P(z)]^{2}cos(P(z))^{2}}dz
(I think I got that right: integral z*sin2(P(z))*cos2(P(z))dz,
where
sin2 and cos2 mean square of sin and cos,
Hi!
Does anyone come across some Matlab code to estimate the parameters for the
Cauchy PDF?? Or some other sources about the method to estimate their
parameters??
Thanks..
CCC
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Can anyone recommend a good text on demand forecasting?
in particular I would like to have information about forecats models
for newspapers sales.
thanks,
simone
Chia C Chong [EMAIL PROTECTED] wrote in message
a5d38d$63e$[EMAIL PROTECTED]">news:a5d38d$63e$[EMAIL PROTECTED]...
Glen [EMAIL PROTECTED] wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
Do you want to make any assumptions about the form of the conditional,
or the joint, or
John Ziker wrote:
This research deals with the classical anthropological question of
food sharing among hunters and gatherers. There are a number of
hypotheses being discussed within the field. This study is relevant
for two models, namely kinship cooperation and reciprocity. The
kinship
Mark wrote:
Hi,
I'm CS student interested in Radford Neal thesis called Bayesian
Learning for Neural Networks. I know that some years ago this thesis
was available for download from author's site, but nowadays there
isn't possible. I have searched it on Intenet so I have not known to
Glen Barnett [EMAIL PROTECTED] wrote in message
a5dev7$8jn$[EMAIL PROTECTED]">news:a5dev7$8jn$[EMAIL PROTECTED]...
Chia C Chong [EMAIL PROTECTED] wrote in message
a5d38d$63e$[EMAIL PROTECTED]">news:a5d38d$63e$[EMAIL PROTECTED]...
Glen [EMAIL PROTECTED] wrote in message
[EMAIL
Hi,
My doubt isan outlier can be a LOW data value in the sample (and not
just the highest) ?
Several text boks dont make this clear !!!
Thanks
V.
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On 25 Feb 2002 07:56:56 -0800, [EMAIL PROTECTED] (kjetil
halvorsen) wrote:
It isstraightforward tlo write down the loglikelihood, and then whatever
optimization routine (there must be one in Matlab) will help you!
Just be careful when searching, because Cauchy likelihoods are
frequently
The editor of Progress in Transplantation is needing
biostatisticians for reviewers. If you are interested, see below.
Mark Eakin
Associate Professor
Information Systems and Management Sciences Department
University of Texas at Arlington
[EMAIL PROTECTED] or
[EMAIL PROTECTED]
The University of Michigan Documents Center has a Web site with links
to statistical resources that might prove invaluable to those
interested in a wide variety of data sources. Check it out.
http://www.lib.umich.edu/govdocs/stats.html
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That being said, occasions can arise where there are outliers other than
from measurement or data entry error. Different disciplines have different
approaches.
What discipline are
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An outlier is any value for a variable that is suspect given the
measurement system, common sense, other values for the variable in
the data set, or the values a case has on other
of course, if one has control over the data, checking the coding and making
sure it is correct is a good thing to do
if you do not have control over that, then there may be very little you can
do with it and in fact, you may be totally UNaware of an outlier problem
i see as a potentially MUCH
Does anybody know how to run this constrained regression in STATA? The
model is Y=b1X1 + b2X2 + b3X3, where b1+b2+b3=1 and 0bi1 for each i.
Thanks.
Emmanuel Salta
[EMAIL PROTECTED]
=
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Voltolini wrote:
Hi,
I would like to know if methods for detecting outliers
using interquartil ranges are indicated for data with
NON normal distribution.
The software Statistica presents this method:
data point value UBV + o.c.*(UBV - LBV)
data point value LBV - o.c.*(UBV - LBV)
Herman Rubin wrote:
In article a5daqb$72k$[EMAIL PROTECTED],
Chia C Chong [EMAIL PROTECTED] wrote:
Hi!
Does anyone come across some Matlab code to estimate the parameters for the
Cauchy PDF?? Or some other sources about the method to estimate their
parameters??
What is so difficult
Voltolini wrote:
Hi,
My doubt isan outlier can be a LOW data value in the sample (and not
just the highest) ?
Several text boks dont make this clear !!!
What makes an outlier an outlier is your model. If your model accounts
for all the observations, you can't really call any of
Jay Tanzman wrote:
I just got chewed out by my boss for modelling the means of some 7-point
semantic differential scales. The scales were part of a written,
self-administered questionnaire, and were laid out like this:
Not stressful 1__ 2__ 3__ 4__ 5__ 6__ 7__ Very stressful
So, why or
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Dear Colleagues
Please find attached a copy of all the forthcoming statistical conferences
Henry Stewart Conference Studies are organizing in the US and Europe. A
reduced rate is offered to all members of academia who wish to attend any of
the courses and conferences we organise.
If anyone is
Art Kendall wrote:
[snip good points]
in your quasi-experiment you can possibly contrast different levels of specific
pollutants, as well as kinds of pollutants, in different rivers at different
times.
I'm not a biologist, but I would be amazed if temperature did not affect
population
Hi,
i calculate some calculations for a specific target variable.
People should rate for 3 things some independends and one dependend
variable. People should not difference in importances as possible
between the 1.,2.and the 3.Chose.
Now i filter all people which rate the same thing (i.e. a
Rich Ulrich wrote:
I've always done this in SPSS (6.1 and earlier) with
ANOVA vara by grps(1,4) with covar/
Likewise.
However, as I'm in a funny mood, it occurred to me that you could
use the residuals from correlating the covariates with the separate
grooup scores as input to a
Henry [EMAIL PROTECTED] wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
On Fri, 22 Feb 2002 08:55:42 +1100, Glen Barnett
[EMAIL PROTECTED] wrote:
Bob [EMAIL PROTECTED] wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
A straight line CDF would imply the data is
Let me take a (somewhat) contrarian position to those previously
expressed. An experiment is any test of a hypothesis. An experiment can
involve the use of observational (unmanipulated) data, as long as the
hypothesis is clearly stated prior to the collection of the data. While
it is true that an
Hi,
This research deals with the classical anthropological question of
food sharing among hunters and gatherers. There are a number of
hypotheses being discussed within the field. This study is relevant
for two models, namely kinship cooperation and reciprocity. The
kinship model predicts
Hi,
I'm CS student interested in Radford Neal thesis called Bayesian
Learning for Neural Networks. I know that some years ago this thesis
was available for download from author's site, but nowadays there
isn't possible. I have searched it on Intenet so I have not known to
find it.
I should be
On 19 Feb 2002 15:14:01 -0800, [EMAIL PROTECTED] (Trevor Bond)
wrote:
[ snip, much ]
affected who won the gold medal. In fact, Looney (1994, p. 156)
concluded:
all of the judges with an Eastern block or communistic background
not only ranked Baiul better than expected, but ranked
Title: RE: SPC control limits
Jay Warner writes:
The 'party line' is to take the first 30 or so points, calculate
limits, throw out any outside ones add more at the end, until you
have 30 points, all of which are inside the control limits.
Actually, I have heard the opposite.
On Sat, 23 Feb 2002 00:27:00 +1100, Glen Barnett
[EMAIL PROTECTED] wrote:
Henry [EMAIL PROTECTED] wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
On Fri, 22 Feb 2002 08:55:42 +1100, Glen Barnett
[EMAIL PROTECTED] wrote:
Bob [EMAIL PROTECTED] wrote in message
[EMAIL
SSCHEINE wrote:
Let me take a (somewhat) contrarian position to those previously
expressed. An experiment is any test of a hypothesis. An experiment can
involve the use of observational (unmanipulated) data, as long as the
hypothesis is clearly stated prior to the collection of the data.
Henry [EMAIL PROTECTED] wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
I was trying to suggest that he meant the slope of the CDF was the
height of the PDF.
Oh, okay. Yes, that would be correct, but it shouldn't be called probability!
Glen
Hi all, many further thanks for the help I recently received on setting
up data for repeated measures analysis, thanks to the help I got here I
have been able to do that analysis.
A further question: it seems one could come up with justifications for
several ways to compute outliers in a
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HP48G, HP49G, MAPLE, SCILAB BOOKS AT BARGAIN PRICES
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Jim said "Reaction time outliers are most often due to
distraction or a missed cue, so that it is usually not necessary to individually
justify excluding each single outlier."
While this may be common practice, you should keep in mind
that it is possible that your experimental treatment
Inasmuch as the objective is to 'drain the swamp' - reduce product
process variation, I find that in practice Wheeler's suggestion of focus
on causes of that variation is on the mark. the procedure from the
old Ford Manual, and I believe the 6th 7th Ed. of Grant Leavenworth,
puts the focus on
Thanks for the enlightenment, George.
I misinterpreted what was said in Numerical Recipes, where it starts
by
referring to the Box-Muller method, then gives your algorithm without
any
intermediate referral. Hence I had always thought of this method as
being B-M.
Hey, I learnt something new, can
Rehabilitation Outcomes Research Scientist
Kessler Medical Rehabilitation Research and Education Corporation,
West Orange, NJ.
Full time position for professional with interest and skills relevant
to research on the outcomes of rehabilitative interventions for persons
with disability,
Bob [EMAIL PROTECTED] wrote in message
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[EMAIL PROTECTED] (Linda) wrote in message
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Hi!
If I plot CDF of a sample data and this CDF looks like a straight line
cross through 0. What does this implies?? Normally, CDF
[EMAIL PROTECTED] (Linda) wrote in message
news:[EMAIL PROTECTED]...
Hi!
If I plot CDF of a sample data and this CDF looks like a straight line
cross through 0. What does this implies?? Normally, CDF will not look
like a straight line but sth like a S2 shape, isn't??
Linda
A straight
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