Re: cronbach alpha for binary responses

Posted by SR Millis-3 on Dec 30, 2009; 9:07pm
URL: http://spssx-discussion.165.s1.nabble.com/cronbach-alpha-for-binary-responses-tp1086058p1086073.html

Or, alternatively, perform a Rasch analysis of the scale to assess unidimensionality of the scale items.

Scott Millis

--- On Wed, 12/30/09, rblack <[hidden email]> wrote:

> From: rblack <[hidden email]>

> Subject: Re: cronbach alpha for binary responses

> "It depends on what you expect alpha to tell you. If you're
> looking
> for confirmation that all the items are "measuring the same
> thing"
> then forget alpha -- you want to factor the items, and you
> should
> probably do it using tetrachoric correlations.

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