Date:         Thu, 17 Nov 2011 16:47:28 -0800
Reply-To:     mmiesner <mmiesner@gmail.com>
Sender:       "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From:         mmiesner <mmiesner@gmail.com>
Subject:      question about measure creation statistics
Content-Type: text/plain; charset=us-ascii

Hello-
I'm creating a measure that currently has 20 items. 18 of these items are
multiple choice, 4 possible answer questions. 2 of the items have 7 possible
answers. All of the items are covering the same broad area (knowledge of
psychological disorder criteria).

I ran cronbach's alpha and the score was .78.
I talked to my advisor, who said this was incorrect and I should have run
KR-20. I did some reading, and two things appear to be true.

First, that in fact, I should be using KR-21 since the answers are not
dichotomous.
Second, that there is no way to do this in SPSS.

Would LOVE some guidance.

Michael

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