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st: RE: Item selectivity


From   "Anderson, Bradley J" <BAnderson1@lifespan.org>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Item selectivity
Date   Tue, 20 Mar 2007 13:46:35 -0400

There are many possible statistics that might be used for item selection in the scale construction process.  The Stata command alpha (see help alpha) gives the Chronbach's alpha statistic, plus calculates alpha if item is deleted and item-rest correlations.

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu]On Behalf Of Vanessa
Mahlberg
Sent: Tuesday, March 20, 2007 11:28 AM
To: statalist@hsphsun2.harvard.edu
Subject: st: Item selectivity


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

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

Thanks for your support
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