95%CI Cronbach's alpha coefficient with SAS
- From: "cat.." <cat.b41@xxxxxxxxx>
- Date: Thu, 24 Apr 2008 02:58:19 -0700 (PDT)
Dear colleagues,
I've been asked to compute the 95%CI for Cronbach alpha coefficient
based on a specific reference. ok, no problem excepted that SAS does
not support it and I cannot use another program.
The reference is: JM Van Zyl et al., "On the distribution of the
maximum-likelihood estimator of conbach's alpha", biometrika, vol 65
(3):271-80, 2000.
This paper is really tricky and I cannot figure out a SAS code for
computing it. I guess it may require SAS/IML langage, which I don't
know at all.
An on-line SAS sample code does exist that computes several 95%CI,
based on several references (but not "mine"). The code is complex and
written in SAS/IML.
Has anyone ever developed such a code ? Any clue for me ?
Another question I am asking to myself is: What if the distributional
validity assumptions are not met ? Is it worth it to calculate this
CI ? Eg: If you had to calculate a 95%CI of a mean on any continuous
variable for which you know that it is not normal. What value could
have this 95% CI ?
Thanks.
Catherine.
.
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