Also of interest are the writings of R.B. Cattell from the '50s and
'60s. There is a nice discussion of his "data box" in the first Handbook
of Multivariate Statistics, published in the mid '60s.
Bill
__________________________________________________________________________
William B. Ware, Professor and Chair Educational Psychology,
CB# 3500 Measurement, and Evaluation
University of North Carolina PHONE (919)-962-7848
Chapel Hill, NC 27599-3500 FAX: (919)-962-1533
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On Wed, 24 Jan 2001, Dale Glaser wrote:
> There is also a nice chapter on Q-techniques by Grimm & Yarnold (2000).
> Reading and understanding more multivariate statistics. DC: APA. ...it is
> authored by Bruce Thompson (ch. 6) and titled: Q-technique factor analysis:
> One variation on the two-mode factor analysis of variables. (pp. 207-226)
>
>
> .........dale glaser
>
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]
> On Behalf Of Rich Ulrich
> Sent: Wednesday, January 24, 2001 7:51 AM
> To: [EMAIL PROTECTED]
> Subject: Re: Q-techniques
>
> On Wed, 24 Jan 2001 13:53:25 GMT, "Paolo Covelli" <[EMAIL PROTECTED]>
> wrote:
>
> > I know that the techniques as principal component analysis, factor
> analysis
> > or canonical correlation analysis are called R-techniques, because the
> > correlation matrix R plays an important role in this approach.
> > Instead techniques such as discriminant analysis, cluster analysis or
> > multidimensional scaling are known as Q-techniques.
> > Why this name?
>
> That's not exactly the way I have seen the distinction.
>
> I am browsing Jum Nunnally, "Psychometric Theory," 1967, page 361.
> He describes the usual R technique with Subjects x Variables (rows and
> columns, respectively). Correlations are between columns
> (variables). P technique has the same person on every row, using
> different Periods or points in time.
>
> Q technique is described as concerning correlations among those rows,
> and, he says, is sometimes referred to as 'transposed' or 'inverted'
> analyses.
>
> The name? Partly because the text goes on to mention O technique,
> I suspect that the "Q" name came from splitting the alphabetical
> difference between P (with its mnemonic excuse) and R.
>
> --
> Rich Ulrich, [EMAIL PROTECTED]
> http://www.pitt.edu/~wpilib/index.html
>
>
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