On Sat, 10 Jun 2000, Sandra wrote:
I'm a PhD student (2nd year). Do you know if there are any summer
courses in statistics?
Useful answers might differ depending on whether the respondent thought
you were studying for a Ph.D. in statistics (and hence would be seeking
statistics courses of
If I understand correctly, the question asks the required sample size
out of the 50 (or so) objects in the box.
Unless some probability is, at least implicitly, specified, I do not see
that this is a statistical question. To be certain whether the "outside"
object has a composition that
On Wed, 14 Jun 2000, dennis roberts wrote:
what approach would one take ... or approaches ... if the question you
wanted to address was:
in what sport ... say at the collegiate level ... is it most likely
that an underdog opponent can knock off or beat ... the favorite?
baseball,
On Wed, 14 Jun 2000, Kumara Sastry wrote:
Suppose I have two random variates X,Y following normal distribution,
X = N(u1,v1)
Y = N(u1-u2, v1(1-z))
where u1 is the mean and v1 is the variance. u2 u1 and z ranges
between 0-0.95. Is there an analytical expression for the covariance of
X
1-b*exp(-c*t) is negative only if b*exp(-c*t) 1, which implies
log(b) c*t, I think. Is this a reasonable circumstance in terms of
the theory that led to the Richards growth curve?
You say this occurs frequently in your data; since b and c are
presumably constants for a given data set,
I've not seen any particularly helpful responses to this post,
so here's my attempt:
On Thu, 15 Jun 2000 [EMAIL PROTECTED] wrote:
Hello, I am a 16 year old student and a beginner to statistics.
I'm lost.
I'll assume you have access to some standard elementary statistics
textbook. If this
Don't know as I can help much, but a few questions occur to mind.
It strikes me that there may be some constraints on the system that you
haven't mentioned. For example:
1. Are features L and R mutually exclusive, so that if L is found
at position i, R cannot be found at that
On Fri, 16 Jun 2000, in reply to Bernd Genser's query
Does anybody know how to calculate the sample size needed to prove
EQUIVALENCE, not difference of two treatments concerning survival
data (log-rank test, cox regression).
Robert Dawson wrote:
Infinite?
The only situation
On Mon, 19 Jun 2000, Donal wrote:
I'm currently analysing data resulting from a study of children's
reading ability.
I shall resist the temptation to quibble over your inability to observe
reading ability (as distinct from some indeterminate lower bound on that
ability) ...
As you
On Tue, 20 Jun 2000, Murtagh wrote:
Firstly, thank you for your comments. Am I right in saying that the two
(equivalent) options I have are:
1.ANOVA
Yijk = mew + Ai + Bj + ABij + Eijk
Ai: a fixed factor representing the treatments (2 levels)
Bj: a fixed factor representing
On Tue, 20 Jun 2000, Rich Ulrich wrote:
On 19 Jun 2000 18:01:28 -0700, [EMAIL PROTECTED] (Dónal Murtagh) wrote:
...
Firstly, thank you for your comments. Am I right in saying that the two
(equivalent) options I have are:
These are not quite equivalent options since the first one
On Tue, 20 Jun 2000, Dale Berger wrote:
If we observe one escape out of 1250 inmates, why can't we reliably
rule out zero as the population escape rate?
Because k = 1 (for n = 1250) is not significantly different from k = 0.
The normal approximation to the binomial may not be appropriate
On Wed, 21 Jun 2000, Dale Berger wrote:
Yet, p=0 is a special case where an outcome is impossible. A
reasonable confidence interval for p should not include zero if the
outcome has been observed in a sample. Not so?
I am unable to reconcile this assertion with the fact that the only
Sig, if you really want help, your request ought to be accompanied by
a legitimate e-mail address. There's really no point in trying to reply
to you when it's evident that any such reply will not get to you:
sig [EMAIL PROTECTED]
Invalid indeed! (Some sort of sick joke?)
On Thu, 22
On Thu, 22 Jun 2000, Alex Yu wrote (slightly edited):
ANOVA is said to be robust against assumption violations when the
sample size is large. However, when the sample size is huge, it tends
to overpower the test and thus the null may be falsely rejected.
Which is a lesser evil? Your
An elementary problem that should be discussed in adequate detail in
your textbook. Consult it.
On Fri, 23 Jun 2000, Rahat Bokhari wrote:
Data for two indenedent variables let for X and Y is available as
below:
For Variable X Mean = 5.61SD= 0.68
For Varable Y Mean =
There is only one object in question? Or will you later want to
generalize your method to other objects?
The object is presumably 3-dimensional. What then are the two
coordinates that you call x and y ? How are they defined with respect
to the object? (I presume they are not defined in
On Thu, 29 Jun 2000, GEORGE PERKINS wrote:
Recently a colleague came in the office with the following problem:
Is there a way to 'load' two individual die so that all sums will be
equally likely?
(I take it that they would like to load the die in such a way that the
sum of 2 is
On 30 Jun 2000, Gautam Sethi wrote:
i wrote a little code in matlab that figures out the density of z = x*y
where x and y are both uniformly distributed. in the code i wrote, x
and y are distributed over the same range and my results show a funky
looking triangular distribution with the
On Fri, 30 Jun 2000, Bob Hayden wrote:
Tom Moore asked...
Does anyone know of a good example of cubic regression that you'd be
willing to share?
and Bob replied with an example. Here's another; Bob, would you forward
it to Tom, as I don't have his address?
As I vaguely recall, I found
On Mon, 3 Jul 2000, Miguel Verdu wrote:
In an ANCOVA where covariate interacts with the independent variable,
should the covariate be nested within the independent variable?. I
would appreciate bibliographic references on this matter.
In general, interaction can be observed only if the
On Sat, 1 Jul 2000, Paul Velleman wrote:
I'm not real comfortable with a polynomial model that takes nearly
half the available degrees of freedom and offers no theoretical
motivation.
"Comfortable" is not a word that much occurs to mind in the context of
polynomial models. From the
On Fri, 30 Jun 2000, dennis roberts wrote:
interesting but ... 3 questions:
1. how can the r squared for the best model be 100% when, the errors
are not all 0s?
R-sq is not 100% exactly, it is reported as 100.0%.
Examining the SS reported shows that R-sq = 3361.7/3361.9 = 99.994%,
On Mon, 3 Jul 2000 Robert Németh [EMAIL PROTECTED] wrote:
Could somebody please advise me in the following problem:
I have a summary score consisting of 5 different items, which are
definitely not independent from each other.
By "summary score", do you mean you are using as a dependent
On 4 Jul 2000, Brian A Bucher wrote:
Is there a freeware (or cheap, $200) software package that can
setup and analyze factorial designs and do response surface analyses?
I looked at the "R" software and I couldn't find references to
factorial designs or response surface anywhere.
Doesn't
I don't have an answer to Alan's question, but a description of another
technique in trying to perceive what a contingency table might be trying
to tell one. Like Alan, I have not seen this mentioned in textbooks;
OTOH, I wouldn't expect to, because I think it analogous to post-hoc
tests in
On Thu, 6 Jul 2000, John Nash wrote (to the AERA-D list):
Many of us operate under the following assumption:
For |skewness coefficient| 1, data is considered to be normally
distributed.
Well.
A normal distribution has skewness = 0; but I presume you know that.
Skewness only
Hi, Karen! Interesting problem. You mention students (each of which has
made a variable multiplicity of ratings on professors), and professors
(each of which has received a variable multiplicity of ratings from
students). You do not mention courses. Are all these ratings for a
single
An interesting reflection -- a form of metamorphosis?
On Mon, 10 Jul 2000, Znarf Akfak wrote:
I'm considering reporting
To whom, for what purpose(s) ? The "several bivariate associations"
part rather suggests that you'll want to be making comparisons,
implicitly if not explicitly; and
On Wed, 12 Jul 2000, Michael Atherton wrote in part:
... If you do not believe this is true, please refer
to the attached bibliography.
I take it this refers to the MSWord document, which was not attached but
embedded in the mail message. It's annoying enough to receive attachments
that are
On Tue, 11 Jul 2000, Znarf Akfak wrote:
In article [EMAIL PROTECTED] (Donald Burrill) wrote:
To whom, for what purpose(s) ? The "several bivariate associations"
part rather suggests that you'll want to be making comparisons,
implicitly if not explicitly; and even if you don'
On Mon, 17 Jul 2000, Simon, Steve, PhD wrote in part:
I have a bad joke about statistical software. I mention a certain
software package and say that it is so wonderful. The best part is
that it allows you to run ten different tests of the same hypothesis
and then you can pick the test
On Sat, 22 Jul 2000, Christopher Tong wrote:
Does anyone have recommendations for introductory
books on regression analysis? I posted this question on
sci.stat.math and got only one reply so far.
Depends on where you're coming from and where you want to go, inter alia.
Your e-mail
On Sat, 22 Jul 2000, Mike Hewitt wrote (edited):
I am looking for assistance in interpreting results of a study. ...
I performed a GLM-repeated measures with three factors (modeling,
self-listening, self-evaluation) in addition to a repeated measure
(test). There was a significant
On Sun, 23 Jul 2000, Christopher Tong wrote, in response to my comment:
However, there is some evidence that in statistics (perhaps more
than in most disciplines) there is a strong interaction between
writing style and reading style, especially at introductory levels;
and perhaps
On Mon, 31 Jul 2000, auda wrote:
What kind of procedure should I use to compare the varience between
different experimental groups?
Well, that depends on a number of things: e.g.,
whether you wish to test a hypothesis, or produce a confidence interval;
whether differences in the means
It's hard to tell just what you have in mind. For one thing, it is not
clear that "bias" is well-defined in the situation you describe, nor
whether you are using the term in a technical or a colloquial sense.
The responses I have seen have addressed some possible meanings you may
have
Sorry -- my earlier reply was interrupted by someone attempting to use
the telephone line.
On Thu, 27 Jul 2000, Terry Chan wrote:
I have numbers (arranged in a 2x2 contingency table -
smokers/nonsmokers, respiratory disease/no disease) for our study
population (of about 1,000). I also
On Wed, 2 Aug 2000, Rich Ulrich wrote:
I have a question of my own - I think FAMILY is not, in general, the
same as EXPERIMENT.
[Thanks to Jerry Dallal for that lovely quote from Rupert Miller!]
I have always understood "experimentwise" to refer to post hoc multiple
comparisons carried out
On Wed, 2 Aug 2000, chris (who, from his e-mail address, clearly does not
desire a personal response) wrote:
I have a doubt as to what is the assumption for normality in a t-test.
Two possibilities:
These may perhaps not exhaust the universe of discourse.
I think it is for the sample
On 3 Aug 2000, DavidS9307 wrote:
I would like to collect data in a school on a survey form where the
respondents enter only a code number to identify themselves. I would
like the code number to be something that the participants will be able
to remember for follow-up data collection in
On Fri, 4 Aug 2000, dennis roberts wrote:
At 09:59 AM 8/4/00 -0400, Bob Hayden wrote, replying to Peter Lewycky:
I've yet to meet an (adult) respondent who did not know his mother's
maiden name and her birthdate. :)
We must meet sometime!-)
can i come too? i remember her maiden name
On Sat, 5 Aug 2000, Gates, Christopher [OMP] wrote:
Donald, thank you so much for your response. I had the opportunity to
converse with my friend (HOH) on this matter again, and his explanation
seemed to closely follow yours, or at least that's how I see it.
I guess the bottom line for
Sounds as though you are confusing a couple of things, as some of the
responders to your message have suggested (though none has said it
explicitly). The idea of "area under a curve" applies to a continuous
curve, and thus to continuous distributions. It doesn't make sense for
discrete
On Wed, 9 Aug 2000, dennis roberts wrote in part:
[You could use] dotplots ...
snip, some commentary about dot plots
[or] a simple old fashioned [character-graphics] histogram ...
Histogram of C1 N = 36
MidpointCount
1.5006 **
2.000
While Dave Howell and Bruce Weaver are technically correct with respect
to simple effects, I am not so certain that simple effects adequately
represent your hypothesis. You write,
"The hypothesis is that harder logic will produce a larger DV
than easy logic, but this will not
On Sun, 13 Aug 2000, AJ wrote:
I'm having trouble in choosing the right method to analyse a large
dataset. I have N data, consisting of measured responses fn(t) all of
the same length T.
This sounds as though you have a N-by-T data matrix: N cases or
observations (as rows in the
On Mon, 14 Aug 2000, Alexander Bogomolny wrote, inter alia:
... If there were alternative definitions, a discussion would be
interesting. At the time of my first post, I was aware only of a
single definition that was found in two mathematics dictionaries and
a statistics book. This is
On Tue, 15 Aug 2000, dennis roberts wrote in part:
why don't students get scared blue with intro psy ... or intro geography?
With respect to psych: Because they haven't yet found out what John
Kemeny wrote about psychology 40 years ago: The only reason psych
students don't have to do more
On Tue, 15 Aug 2000, Sheila King wrote in part:
I guess what I really want to know is this:
What should I say to my students about the text book's presentation.
I suppose I can simply say:
"The book is not really clear on this point, and confuses things by
including ME in the section on
On Thu, 17 Aug 2000, Chris Chiu wrote:
Does anyone happen to know of a way to generate integers that have a
normal distribution or a distribution close to a normal distribution?
Well, integers cannot have a _normal_ distribution, they can only have a
distribution that is more or less well
²S¢Ì½bÂnFO ¥Â\(Ù+Ä3Eb+Ûç4tTwo different strategies occur to mind, both of
which Ç ¾õÚ\ªò®¯ght I suppose be implemented severally:
Garray of pixels, Ó¼¤m®o¤[ê¾Ñ3sÆso that each pixel may be thought of as at
the intersection of a row and }cÓé¹ù`®ÓMЬÇ)ÀHHWì_Ä3(U
a column of pixels. There are
Sorry about that. Someone else tried to call out on the phone line I was
logged in on. What I was trying to say was:
Two different strategies occur to mind, both of which might I suppose be
implemented severally:
1. I suppose your image is a rectangular array of pixels, so that each
On Sun, 20 Aug 2000, jkroger wrote:
Hello, I am trying to determine a statistical difference, but am having
some difficulty determining what test should be used.
There are competent statisticians at your university, and I believe they
operate a statistical consulting service. You would do
On Sun, 20 Aug 2000, jkroger wrote in part:
I want to show that in some conditions, the difference between the length
of A's response and B's response is greater than in other conditions:
duration(A) - duration(B) is significantly greater in some conditions.
I tried a t-test for each
For openers, you're going to have to describe your problem with a good
deal more precision, in order for anyone to provide any kind of useful
help.
On Fri, 18 Aug 2000, Veeral Patel wrote:
I have a data whose histogram has a unique distribution exhibited by
it. I am trying to fit
Clarification(s), please:
On Wed, 23 Aug 2000, Ken Reed wrote:
I'm trying to test whether a variable measures a group-level property,
and so I'm looking for an analog to eta-squared, intra-class correlation
etc for nominal or ordinal data.
Do you have a particular group-level property in
On Fri, 25 Aug 2000, William Levine wrote:
I am teaching an Introduction to Statistics course in psychology, and
in class the other day, I brought up the issue that SAT scores and IQ
scores may not really be interval scales.
Mmm. Well, Bill, if they aren't "really" interval scales, what
Jeff, I suspect there are some important things you're not telling us
here. Are these comparisons being carried out over a variety of
conditions of some kind (temperature, perhaps, length of time, or
concentration of a catalyst, or pH, or ...)?
(If not, how does one observe multiple values
On Mon, 28 Aug 2000, Ronny Richardson wrote:
Several references I have looked at define skewness as follows:
mean median: positive, or right-skewness
mean = median: symmetry, or zero-skewness
mean median: negative, or left-skewness
He then gave two small (N = 20)
I've taken the liberty of copying this to the edstat list, and therefore
have quoted the original posting in full, despite having (at the moment)
a comment on only one part of it. -- DFB.
On Tue, 29 Aug 2000, Paul Dudgeon wrote:
Somewhat tangential to the discussion last week about p
On Fri, 8 Sep 2000, Magill, Brett wrote:
Is there a difference between a Nested Model in general and what is
referred to as a hierarchical linear model?
On my understanding that "hierarchical linear model" is the same as
"multilevel model", a nested model is in general a particular instance
On Fri, 29 Sep 2000, Luís Silva wrote:
For a certain variable I applied a Three Factor ANOVA and found a
significant interaction between two factors.
Was this the only significant effect, or were there others?
Actually, it would be easier to address your question usefully if
you'd supply
I don't usually respond to anonymous querents, but the problem is
intriguing.
On Sat, 30 Sep 2000 [EMAIL PROTECTED] wrote:
I constructed a D-optimal design for 6 continuous variables, each at
three levels.
Is that 6 predictors, or 5 predictors and a response variable?
I have 31 runs.
Standard one-way analysis of covariance (with three groups) will do this
for you.
-- DFB.
On 8 Oct 2000, Stanley110 wrote:
Assume I have three sets of x,y data. I fit each by least-squares to a
straight line. I determine that the three fitted lines are homogeneous
Ambiguous question. By "beta" do you mean (as some would) a standardized
regression coefficient? Or do you mean (as some would, perhaps
especially in the context of testing hypotheses) the population value of
a raw regression coefficient?
Further, you specify "multiple regression
On Thu, 12 Oct 2000, dennis roberts wrote in part:
one nice full issue of a journal about this general topic of
hull hypothesis testing ...
Dealing with problems in naval architecture, one presumes?
-- Don.
On Sat, 14 Oct 2000 [EMAIL PROTECTED] wrote, inter alia:
I *would* argue that without some method to determine the likelihood of
a difference b/w two conditions you have no chance of determining
practical importance at all.
But hypothesis testing procedures do not establish any such
On Thu, 19 Oct 2000 [EMAIL PROTECTED] wrote:
In article [EMAIL PROTECTED],
Peter Lewycky [EMAIL PROTECTED] wrote:
I've often been called upon to do a t-test with 5 animals in one
group and 4 animals in the other. The power is abysmally low and
rarely do I get a p less than 0.05. One
On Sat, 21 Oct 2000, dennis roberts wrote:
At 06:14 AM 10/21/00 +, Eric Bohlman wrote:
snip, a couple of quibbles answered by Eric
2a) It demonstrates that variations in the relative sizes of the group
will result in variations in the magnitude of the correlation, even if the
On Sat, 21 Oct 2000, Bill Jefferys wrote:
At 12:56 PM -0500 10/20/00, dennis roberts wrote:
randomly independent events have the p value being the multiplication of
each event's p value ... so ... p for getting a head in a good coin
is .5 ... 2 in a row = .25 ... etc.
This is wrong.
On Wed, 25 Oct 2000, Wolfgang Rolke asked:
I am wondering how they find the Sampling error of +/-4% pts. The usual
estimate for the standard error of a binomial would be (for Bush)
SQRT(0.46*(1-0.46)/769) = 0.01797
The error in a 95% CI would then be 1.96*0.01797 = 3.5%
and in a 99%
On Sun, 22 Oct 2000, dennis roberts wrote:
don ... no wonder students go bananas in statistics ... if we "sink" to
this level of discussion about a formula ... a formula that really has
so little utility ... how much time do we spend on the really important
ones?
I would have thought
On 27 Oct 2000, Dr. S. Shapiro wrote:
I have quantified experimentally the activity ("X") of a
half-dozen different products (A-F). These 6 commercial
products all contain the same "active ingredient" over a
range of different concentrations (and a couple of products
share the same
On Sat, 28 Oct 2000, Martin Boulger (impersonating haytham siala) wrote:
I have to mark scripts based on a marking scheme thus:
How much of the ensuing paragraph comprises requirements externally
imposed upon you and not subject to your control, what conditions are
debatable, and which ones
On Sat, 11 Nov 2000, Ick-Joong Chung wrote:
I have a question about two-sample problem. I am comparing coefficients
of two samples (poor and non-poor) and would like to investigate whether
the difference between two coefficients is statistically significant ('one
on one' level as well as
On 18 Nov 2000, Herman Rubin wrote, inter alia:
Dixville Notch, Vermont votes at midnight, and is widely
reported. But I doubt that this is what you mean.
Dixville Notch is in New Hampshire. :-)
(In fact, I'm not at all sure that any place except New Hampshire uses
"notch" for a pass
On Mon, 20 Nov 2000, Karl L. Wuensch wrote:
Chris said :"Since both the null and alternative are generally false,"
Now I'm confused. I always thought that null and alternative were
mutually exclusive and exhaustive, as in "parameter LE value" versus
"parameter GT value."
No, you're not
On Thu, 23 Nov 2000, Jay Warner wrote in part:
And when you have made your way through it, send me an email, telling me
how well it worked for you - that's your 'cost' for using it!
Since you asked the entire Edstat list for advice, it would be courteous
to copy that e-mail to the list.
I'm not a SAS expert; but the error messages you quote look like what one
might expect if the correlation matrix had been output as the lower
triangular half only, and the factor procedure were expecting the complete
square matrix. You didn't supply your protocol for creating the
correlation
On Wed, 29 Nov 2000, Kathryn, alias [EMAIL PROTECTED], wrote:
Hi there, I am a student conducting an experiment about the McGurk Effect
(where when a word is seen spoken while a different word is heard through
headphones, the perceived word is an integration of the two). I am hoping
to cue
On Tue, 5 Dec 2000 the anonymous correspondent
"[EMAIL PROTECTED]" wrote:
Where can I find authoritative data on the undervotes observed in the
various counties in Florida for the Presidential Election?
My students have suggested that a t-test should be applied determine
the level of
On Sat, 9 Dec 2000 [EMAIL PROTECTED] wrote:
Since the vote difference between Bush and Gore falls within the margin
of error for the counting process, ...
Is it, indeed? How do you define "margin of error" for this process?
... declaring the winner is mathematically indeterminable ...
On Sun, 17 Dec 2000, xprot wrote:
What are the odds against rolling a pair of dice 6 separate times, and
not rolling a 7, 11, or any doubles?
Without thinking about it too hard, I make the probability of this event
about 0.052. (I may be wrong; I muffed it the first time through.)
If you
On Sat, 23 Dec 2000, Jake wrote, inter alia:
P.S. Canada handcounted thirteen million votes in 2.5 hours. We look
like idiots.
Yes, well, perhaps we are. There appears not to be much in the
way of counter-evidence, and there may be some debate over what counts
;-) as evidence...
Two comments:
(1) If the coins are numbered (on the non-zero side) 1, 2, 4, 8, ...
then each possible total occurs exactly once. If Derek's coins are
labelled 0 and X (X = 1, 2, 3, ...), these new coins are labelled 0 and
2^(X-1). I don't know if this observation is helpful, since I don't
Jim, a few comments in addition to those made by other respondents:
On Mon, 15 Jan 2001, Jim Kroger wrote in part:
I'm doing a two-way, 2X2 ANOVA. Suppose I have 20 subjects, and each has
25 observations of the following types:
drug1-doseA (25 for each subject)
drug1-doseB ( " )
A quibble, and a question (or maybe several, of each), Rich:
On Thu, 25 Jan 2001, Rich Ulrich wrote, inter alia:
By the way, if you have Pre-Post on one measure, you
almost need to plot the points on a well-labeled graph
(what is max, what is min?) before you BEGIN to draw
conclusions.
On Sun, 28 Jan 2001, Veeral Patel wrote in part:
Out of curiousty i decided to write a small prog to perform the A-D test in
matlab for the gumbel distribution. Obtaining the gumbel parameters is easy.
however the difficulty is in the actual A-D computation formula as stated by
On Fri, 26 Jan 2001, Rich Ulrich quoted me:
DB: What most people who use "ordinal" and "disordinal" seem to mean
is a plot of the cell means (or of regression lines), with no
adjustment for main effects: so, a display that includes the
interaction AND the main effects. I take it
On Mon, 29 Jan 2001, Chris wrote in part:
My current job requires me to analyze margins from the sales of various
products and provide an average for each during the quarter. I am using a
very large sample of all product sales by month. (Margin, i.e. not markup.
For those not familiar,
On Tue, 30 Jan 2001, Kathleen Bloom wrote:
If you have unequal n's, and want to determine linear parameters, you can
develop new coefficients by taking the normal unweighted coefficients
(e.g., -1, 0, +1, for three group design) and the formula:
n1(X1) + n2(X2) + n3(X3)/ n1+n2+n3
A quick reply. Looks somewhat like the second course ("Intermediate
Statistics and Research Design") I taught for some years at OISE,
Toronto, which was (and is) the Graduate Department of Education for
the University of Toronto. Ask for more later if you want...
On Tue, 20 Feb 2001, Lise
Perhaps jthis is too superficial -- no time to think more deeply just
now. But I suspect the difference between your two scenarios below is
that with exactly 5 computers to deal with (i.e., population size = 5)
you are sampling without replacement (which is only sensible, for the
background
On Wed, 28 Feb 2001, Mike Granaas wrote in part (and 2 paragraphs of
descriptive prose quoted at the end):
... is there some method that will allow him to get the prediction
equation he wants?
Probably the best approach is the multilevel (aka hierarchical) modelling
advocated by previous
On Thu, 22 Mar 2001, Paul R Swank wrote:
I prefer the ocular test myself.
Were you referring to the intraocular traumatic test?
(It strikes you between the eyes.)
-- Don.
Donald
On Sat, 28 Apr 2001 [EMAIL PROTECTED] wrote:
I just joined the listserv. Our professor is giving us extra credit if
we join an email list re: stats. I was able to pull up one of his
messages from last year. Pretty cool. Have a great day!
You might ask him whether additional extra
On Fri, 4 May 2001, Alan McLean wrote:
Can anyone tell me what is the distribution of the ratio of sample
variances when the ratio of population variances is not 1, but some
specified other number?
Depends. If the two samples on which the variances are based are
_independent_,
In response to Doug Sawyer's post:
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 subset of questions could be
On Fri, 22 Jun 2001, Marc Esser wrote:
After a closer look at the trials which I want to summarize, I noticed
that not the means are reported, but the medians.
Do you have an idea how to calculate an effect size with this
information, e.g. median change of hospitalization time.
The
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