```Date: Wed, 26 Apr 2006 15:23:55 +0200 Reply-To: a.smulders@beke.nl Sender: "SPSSX(r) Discussion" From: Antoon Smulders Subject: Re: Factor Analysis using different Likert Scales Comments: To: Spousta Jan In-Reply-To: Content-Type: text/plain; charset="US-ASCII" Hello Jan Do I have to take your remark that the results are *not too much* influenced litteraly? If so, is there some kind of limit? Can I, for instance combine 1-4 scales with 1-10 scales ("scool notes" in some countries)? Regards, Antoon Smulders -----Oorspronkelijk bericht----- Van: SPSSX(r) Discussion [mailto:SPSSX-L@LISTSERV.UGA.EDU] Namens Spousta Jan Verzonden: woensdag 26 april 2006 11:10 Aan: SPSSX-L@LISTSERV.UGA.EDU Onderwerp: Re: Factor Analysis using different Likert Scales Hi Mike, In my opinion it is OK to use 1-4 scales, especially if the solution gives more sense. In FA, you analyse the correlations and not spreads of the individual scales, and therefore the results are not too much influenced by it. Another possibility would be to fix the number of factor as 6. You have the right to do it - the default Kaiser rule is only a rule of thumb. Greetings Jan ________________________________ From: SPSSX(r) Discussion [mailto:SPSSX-L@LISTSERV.UGA.EDU] On Behalf Of Michael Breen Sent: Tuesday, April 25, 2006 10:33 PM To: SPSSX-L@LISTSERV.UGA.EDU Subject: Factor Analysis using different Likert Scales I am trying to analyze some survey data by using factor analysis to determine which groups of questions could be combined. Almost all of the questions are on a 1-5 Likert scale. Two of the questions are on a 1-4 scale. When I include these two using the 1-4 scale the way the variables load on to each of the factors makes sense. But when I exclude the two on the 1-4 scale I get 8 factors instead of 6. The additional factors make sense somewhat but they are not as clear. My question is can you perform a reliable factor analysis with questions using slightly different likert scales? About 20 of the questions are on a 1-5 scale and the other two are on a 1-4 scale. Thanks, Mike ```

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