Date: Mon, 14 Feb 2005 15:55:35 0300
ReplyTo: Hector Maletta <hmaletta@fibertel.com.ar>
Sender: "SPSSX(r) Discussion" <SPSSXL@LISTSERV.UGA.EDU>
From: Hector Maletta <hmaletta@fibertel.com.ar>
Subject: Re: help factor analysis
InReplyTo: <1dbd313405021410473ced8ce2@mail.gmail.com>
ContentType: text/plain; charset="usascii"
Nico,
I'm afraid the option is not available in the menu. You have to PASTE the
syntax and then edit it, or directly write the syntax. It is the CRITERIA
subcommand under the RCONVERGE keyword (for rotation) or ECONVERGE (for
extraction). Example:
FACTOR
/VARIABLES VAR1 TO VAR45
/MISSING LISTWISE /ANALYSIS VAR1 TO VAR45
/PRINT INITIAL EXTRACTION
/CRITERIA ITERATE(25) RCONVERGE (0.01)
/EXTRACTION PC
/ROTATION VARIMAX
/METHOD=CORRELATION .
The default value for RCONVERGE and ECONVERGE is 0.001.
Hector
> Original Message
> From: SPSSX(r) Discussion [mailto:SPSSXL@LISTSERV.UGA.EDU]
> On Behalf Of Nico Peruzzi
> Sent: Monday, February 14, 2005 3:47 PM
> To: SPSSXL@LISTSERV.UGA.EDU
> Subject: Re: help factor analysis
>
>
> Hector,
>
> I'm in SPSS 11. Do you know under which submenu one can
> adjust the convergence criterion, as you described?
>
> Thanks, Nico
>
>
> On Mon, 14 Feb 2005 14:53:07 0300, Hector Maletta
> <hmaletta@fibertel.com.ar> wrote:
> > 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.
> >
> > Hector
> >
> > > Original Message
> > > From: SPSSX(r) Discussion [mailto:SPSSXL@LISTSERV.UGA.EDU] On
> > > Behalf Of Mpundu Mukanga
> > > Sent: Monday, February 14, 2005 2:25 PM
> > > To: SPSSXL@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)
> > >
> > >
> > >
> > >
> > > 
> > > Do you Yahoo!?
> > > Yahoo! Mail  250MB free storage. Do more. Manage less.
> > >
> >
>
>
> 
> Nico Peruzzi, Ph.D.
>
