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Re: st: RE: Item selectivity
On 20 M�rta 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.
=========
Ron�n Conroy
Royal College of Surgeons in Ireland
[email protected]
+353 (0) 1 402 2431
+353 (0) 87 799 97 95
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