On Wed, 3 May 2000, Paul Gardner wrote, inter alia:
> I can reduce all this to a single maxim:
> Factor analysis is an art as well as a science.
^^
I would have written ... "rather than" ...
Cheers!
I would add another criterion, which is qualitative, and therefore not
reducible to a quantitative rule:
3. Use your professional judgement. Does the pattern of factor loadings
make sense? For example, if the variables are item scores on a
multi-dimensional instrument, can you see a meaningful
Hi Don,
There are times when I realise the rust that has accumulated, and this is one
of them.
Changing the order of things a little, you (and D&S) are of course quite
correct that X variables are typically correlated, and that if they are not
the coefficients are the same as if a set of simple
I would like to compare two different groups of prisonners on a
psychopathy test (PCL-R, for those who like to know). One has been
evaluated on the basis of an interview as well as on the basis of their
personal and correctional files. The second group has only been
evaluated on the basis of their
On Tue, 02 May 2000 03:42:52 GMT, Mike and Michele Hewitt
<[EMAIL PROTECTED]> wrote:
> Can anyone tell me the conditions for using Roy's Largest Root for
> multivariate repeated measures rather than the Pillai's, Wilks, or
> Hotelling's which may be "more conservative and perhaps less powerful".
There are several rules. The most popular two are:
1. Kasier criterion: retain the factor when eigenvalue is larger than 1
2. Scree plot: Basically, it is eyeballing. Plot the number of factors
and the eigenvalue and see where the sharp turn is.
Hope it helps.
As a statistician who works on large class-action lawsuits for various
attorneys, I respond by saying that I do all work for these cases in
Stata (http://www.stata.com) and I use both DBMS/COPY and Stat/Transfer
for import and export issues. The speed, flexibility and power of Stata
are, for thes
Would any of you know a rule of thumb for selecting the proper (of
optimal) number of factors to be extracted from a factor analysis.
Also, how many variables can there be in such factor (is two variable
in one factor not enough?).
Sorry for my english...
Sent via Deja.com http://www.deja.com/
Vincent Vinh-Hung wrote:
> General question,
> I've seen two descriptions of "logarithmic distribution".
> One is related to the frequency of digits called Benford's law (digit 1
> occurs more frequently than 2, 2 than 3, etc) whose explanation is that
> it is the result of a mixture of distrib
but, another alternative is to think about not ONE package ... but perhaps
2 ... sure, to become comfortable with both, it takes more time BUT, many
packages allow for pretty good inter changeability of worksheets AND ...
there are some student editions that would keep the cost down ...
i woul
On Tue, 02 May 2000 13:34:49 GMT, [EMAIL PROTECTED] wrote:
>In article <[EMAIL PROTECTED]>,
> [EMAIL PROTECTED] (SAlbert) wrote:
>> Cheryl makes a good point: the "right" package depends on what the
>user wants
>> to do. MINITAB might be a good choice -- or SPSS, or any of dozens of
>others.
>
All -
I'm looking for references on the analysis of run charts - that is, plots of
data arranged in time sequence. They are similar to Shewhart (Control)
Charts, but are not as powerful and are typically used when the number of
time points is too small for control chart analysis. I have a list
In article <[EMAIL PROTECTED]>,
[EMAIL PROTECTED] (SAlbert) wrote:
> Cheryl makes a good point: the "right" package depends on what the
user wants
> to do. MINITAB might be a good choice -- or SPSS, or any of dozens of
others.
> Is the application area psychology? Biology? Economics?
Meteoro
Tatsuoka, M. (1988), Multivariate Analysis, has a few pages that discusses some of the
different situations where one criterion might be preferred over another.
rb
--- Mike and Michele Hewitt wrote:
Hope that got your attention:)
Can anyone tell me the conditions for using Roy's Largest Root
In article <[EMAIL PROTECTED]>, [EMAIL PROTECTED] says...
> It depends.
> What kinds of stat will you do?
> How much value do you put on your time?
> What disciplines do you work with?
> Who can you get help from?
> Who will go over you syntax and outputs to check your work?
>
> If you need to d
I finished two courses of statistics already. I am looking for a good book
that is easy to study by myself during the summer. The level would be after
the first two intro-stat classes, maybe like regression analyis... If
anyone has any suggestion, I really appreciate.
Sincerely,
Brian V
Lognormal I believe most often is used to describe a normal
distribution after logarithm transform, while logarithmic
distribution in the sense of Kendall-Stuart is else (I didn't
really grasp KS' formalism).
BTW, I queried how the fit was done because I can't find the same
figures as the Fisher
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