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Re: st: RE: Item selectivity


From   Ronán Conroy <rconroy@rcsi.ie>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: Item selectivity
Date   Tue, 20 Mar 2007 18:03:43 +0000

On 20 Márta 2007, at 17:46, Anderson, Bradley J wrote:

Dear stata members,

I want to do an item selectivity but I don?t know the stata command (I
always use SPSS). Is it right that I use the correlation between the
item and the total sum of the construct, e.g:
correlate allgAZ GesamtAZ
You need to investigate the options for -alpha-, notably -item- and - detail-


But then I don?t get any significane level.......

The significance level would be a test that the item had no correlation with the rest of the test, which is not a sensible hypothesis. Neither is the hypothesis that the test has a reliability of zero.

If you want to select items, I suggest you try -msp- which is a nonparametric method of constructing a scale or scales from an item pool.

Try

. findit msp

to find it.


=========
Ronán Conroy
Royal College of Surgeons in Ireland
rconroy@rcsi.ie
+353 (0) 1 402 2431
+353 (0) 87 799 97 95
http://www.flickr.com/photos/ronanconroy




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