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Thread: Cronbach Alpha vs Pearson r

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    Re: Cronbach Alpha vs Pearson r




    Quote Originally Posted by DaniellaS View Post
    wouldn't it be meaningful to use the Spearman r instead of the Perason r to compute the Cronbach alpha?
    Spearman's rho doesn't translate as easily as the ratio of variance explained to total variance like Pearson's r does. keep in mind that the Spearman assumes a rank transformation of continuous data.

    the more correct way to approach reliability for ordinal data from a factor analytic point of view (like Cronbach's alpha does) is by using the matrix of tetrachoric or polychoric correlations to calculate alpha.
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    Re: Cronbach Alpha vs Pearson r


    I think I came up with a better way to measure internal consistency reliability based on L-comoment theory i.e.the L-correlation, which is a hybrid between the Pearson and Spearmen correlations......see here:

    http://www.google.com/url?sa=t&rct=j...76943099,d.aWw

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