Date: Mon, 14 Feb 2005 10:47:04 -0800
Reply-To: Nico Peruzzi <firstname.lastname@example.org>
Sender: "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From: Nico Peruzzi <email@example.com>
Subject: Re: help factor analysis
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I'm in SPSS 11. Do you know under which sub-menu one can adjust the
convergence criterion, as you described?
On Mon, 14 Feb 2005 14:53:07 -0300, Hector Maletta
> It is customary, though not conceptually right, to treat Likert scales as
> interval scales, e.g. for doing factor analysis or for getting sums and
> average scores.
> If your rotation fails to converge after 25 iterations, you may (1) increase
> the convergence criterion (say from 0.0001 to 0.001), or (2) increase the
> number of iterations (not much hope there), or (3) forget about rotation
> (which is not what you want to do). The first one seems the most promising.
> > -----Original Message-----
> > From: SPSSX(r) Discussion [mailto:SPSSX-L@LISTSERV.UGA.EDU]
> > On Behalf Of Mpundu Mukanga
> > Sent: Monday, February 14, 2005 2:25 PM
> > To: SPSSX-L@LISTSERV.UGA.EDU
> > Subject: help factor analysis
> > I have likert type data...trying to perfom factor analysis.
> > When I specify the number of factors I am getting the error
> > as shown below. Any syntax and pointers would greatly help.
> > What is happening is here? what am I doing wrong? what does
> > that say about the data? Any reasons why rotation is not
> > converging? I maybe wrong here but I want to use promax
> > results but what I would like to do first is to compare it
> > against Varimax and Oblimin rotations. I want to try to
> > extract different factors and try different rotations and and
> > report the results that makes the most sense but I am getting
> > this error in most cases.
> > Secondly is it a recommended practice to sum up or average
> > the scales scores? what i would like to do is create scales
> > for each factor.
> > I am told that the correlation coefficient matrix that
> > rotations are based on in SPSS are not ideal for ordinal
> > data? if not what alternatives are available?
> > Thanks for help
> > Rotated Component Matrix(a)
> > a Rotation failed to converge in 25 iterations. (Convergence = .000).
> > "Rotated Component Matrix(a)
> > ---------------------------------
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Nico Peruzzi, Ph.D.