Re: categorical data analysis question

Posted by Bruce Weaver on May 20, 2015; 1:27pm
URL: http://spssx-discussion.165.s1.nabble.com/categorical-data-analysis-question-tp5729576p5729580.html

Good morning Gene.  You say you want "to see to what extent scale items have the same frequency distribution".  I think that translates to comparing the marginal frequencies (or probabilities) for a series of 4x4 tables.  From the FM entry for CROSSTABS > STATISTICS:

MCNEMAR. Display a test of symmetry for square tables. The McNemar test is displayed for 2 x 2 tables,
and the McNemar-Bowker test, for larger tables.

If there is some generalization of Bowker's test for tables of higher dimensions (e.g., 4x4x4), I am unaware of it.  

For visual comparison of the distributions, I think clustered bar charts would do the trick.

HTH.

Maguin, Eugene wrote

I have 4-point likert type responses to survey items that are supposed to define several scales. Some items on each scale are reversed. Perhaps this is a poorly considered idea but what I'd like to do, after reversing the reversed items, is to see to what extent scale items have the same frequency distribution. I was looking through the selection of non-parametric tests and it seems that the Friedman test might be appropriate. However, (Q1) the Friedman is described as being for 'related' samples. I am unsure of the meaning of 'related samples? Help please.

Q2. Is there a better way to go at this?

Thanks, Gene Maguin


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