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I would use scores based on the scoring key. The scoring key
describes the set items are to be used as measures of the construct
underlying the factor.
Be sure you use PAF. So that you are using only the item variance that is common to the set (factor). The varimax rotated items that have high enough loading, that load cleanly, and that make substantive sense are listed in a scoring key so you and others can see what you are doing. {other would be a QA reviewer, a person trying to help, someone who looks up archives, etc.] example of scoring key: compute factorname1 = mean.5(item1, Item23,ReversedItem24, item42, ReversedItem55, Item65, item71). Compute facorname2 = mean.4(item2, reversedItem4, Item23, ReversedItem51, Item59). In my opinion, YMMV, If your response scales are dichotomies I would be leery of a scale with fewer than 10 or so items, if your response scales have 5 values I would be leery of a scale with fewer than 4 items. I would also run a Reliability on each scale and (1) double check the scoring key (2) drop any scale that does not have an alpha at least .7. (3) drop any item that decreases alpha but anything meaningful. I have been doing factor analysis and cluster analysis since 1972 and would never rely on a single method of cluster analysis. On 6/2/2014 9:05 AM, Daria Redko wrote:
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Art Kendall
Social Research Consultants |
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I will be on vacation and out of the country until March 30. |
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In reply to this post by Art Kendall
Art, was this meant for the usenet newsgroup?
https://groups.google.com/forum/#!topic/comp.soft-sys.stat.spss/R_QrVrdn3Xo ;-)
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