This has nothing to do with normal distributions, as Robert Dawson noted
yesterday. The article I cited makes no mention of normal distributions,
and I didn't mean to imply that it did.
Rich Strauss
At 04:29 AM 11/29/01 +, Jerry Dallal wrote:
>Rich Strauss <[EMAIL PROTECTED]>
>If the trend continues nationwide, this newspaper could someday report
>that an apparently alarming cluster of cancer cases has arisen in an
>innocuous normal distribution, and students will be able to explain to
>their parents what that means.
The reporting of cancer clusters already happens on
iginal-recipient: rfc822;[EMAIL PROTECTED]
>
>Hi
>
>On 16 Nov 2001, Rich Strauss wrote:
>> I've just done some quick simulations in Matlab, constructing randomized
>> null distributions of the t-statistic under both scenarious: (1) sample
>> variances based on
c should indeed be calculated about a pooled
estimate of the common mean, as Jerry Dallal suggested.
I could pass on the details of my simulation if anyone is interested, but
mostly I'd appreciate it if someone could repeat this simulation
indep
omething obvious here but I can't
quite get a handle on it, and this little problem is holding up the
analysis of the results from a much larger study. I've talked to
statisticians on campus, with little progress, so basically I'm begging for
help.
Rich Strauss
At 10:47 AM 7/25/01
to do this for the entire matrix. I'd really appreciate ideas about this.
Thanks in advance.
Rich Strauss
=
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n.
Can someone point me in the right direction?
Thanks in advance.
Rich Strauss
Dr Richard E Strauss
Biological Sciences
Texas Tech University
Lubbock TX 79409-3131
Email: [EMAIL PROTECTED] (formerly [EMAIL PROTECTED])
Phone:
are the variances of the
original log-transformed data using Levene's test or equivalent.
Rich Strauss
At 07:56 AM 10/30/00 -0500, you wrote:
>Hi!
>
>My question is on a test to compare CVs. The CVs are computed using the
>same data but two different variance methods and I have to
ecomes slightly ill-conditioned. The eigen procedure
successfully 'corrects' the matrix.
Rich Strauss
Dr Richard E Strauss
Biological Sciences
Texas Tech University
Lubbock TX 79409-3131
Email: [E
n to the mean (147-166)
Chesher A.
Using regression models for prediction: shrinkage and regression to the
mean (167-183)
Copas J.
Rich Strauss
Dr Richard E Strauss
Biological Sciences
Texas Tech University
dimensions, rather than one) and clustered, and also how
distances are measured among observations in Kendall's shape spaces (e.g.,
Procrustes distances), so there's a well established literature.
Rich Strauss
At 05:32 PM 4/14/00 +0200, you wrote:
>Hi everybody.
>I face the probl
k out the literature on extreme
value theory, such as Castillo's book "Extreme value theory in engineering"
(1988 I believe, but I don't know the publisher). There's a good but
scattered geomorphometry literature on the occurrence of extreme
earthquakes, floods, waves,
all assume that the data really
are proportions, not ratios -- that is, that the denominator is fixed among
all values, not variable. The problem is that many people use the terms
interchangably, talking about proportions or percentages when they're
actually dealing with ratios.
Rich Strauss
as the original sample. The former is
bootstrapping in the traditional sense, of course, while the latter is a
form of Monte Carlo simulation. Unfortunately, the new terminology seems
to be spreading rapidly.
Rich Strauss
Dr Richard E Strauss
Biolog
r
the adjustment is consistent with the changes I made in the matrix leading
up to the ill-conditioning.
So if anyone has any further thoughts on this, or if you're interested in
the results, please let me know. And thanks again for the help I've gotten
so far.
Rich Strauss
At 12:00 PM
the PD matrix that is "closest" to the target? After a
reasonably thorough literature search and perusal of texts on linear
algebra and related topics, I've failed to find any literature relevant to
this problem. Any suggests on how to proceed, or citations that I
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