How can I calculate Cronbach's alpha using SPSS with two variables (categorical and continuous variable)?

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Jagdish Khubchandani

Alpha reliabilities are the standard approach for summated scales built from grouped-ordinal or continuous items. A variation (KR-20) (Kuder-Richardson's formula) can be used with dichotomous items.

Mark Camilleri

Hi Geoffrey,

Please find attached an explanation of Cronbach's alpha. This article explains its use very well.

Mark

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2792363/

Michail Tsagris

Hi Geoffrey, all the variables must be in the same scale, i.e all categorical, or all continuous. That is not your case. However Subhashisa's steps are helpful

Geoffrey Chima Nwakwuo

Thanks for all your help