Re: Sum score

Posted by Art Kendall on Oct 31, 2011; 11:19am
URL: http://spssx-discussion.165.s1.nabble.com/Sum-score-tp4950280p4952207.html

First you have to decide how many factors to retain.
You do NOT want all factors that have eigenvalues that exceed 1.00.
Look up "parallel analysis" in the archives for this list.
Use Varimax to help with divergent validity.
When you have number for how many factors to retain find out which items load _cleanly_ on the factors.
Reflect items that have negative loading.
Use a compute something like
compute score1 = sum(item1, item8, item13, item17, item 44).
to put the summative score on the same scale (or do deal with a few missing values on items)
compute score1 = mean(item1, item8, item13, item17, item 44).

then if you just want a histogram to eyeball (rather than publish)
frequencies variables = score1/barchart/hist=normal.

See if this is what you are looking for, people on the list can give more info if you explain in more detail what you want to do.

Art Kendall
Social Research Consultants.

On 10/30/2011 11:59 AM, MySelf wrote:

I'm using spss 15.0 and need some help with sum score.

I'm planning to use factor analysis to get fewer variables in my dataset.
I'm then planning to use "sum score by factor" to see how the variation in
the original data in each factor is. I want to view this as a frequence
histogram.

(My variables uses a likertscale with values from 1-4. And let's say that my
factor consists of 5 variables. Then I want the values on the histogram to
be from 5-20.)

How do I do this in SPSS?

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