To calculate Cronbach's alpha I have to use two types of variables. One type is dichotomous, coded as 0 and 1, 25 of them, and another type is ordinary with five categories: 1 2 3 4 and 5, 4 of them. I should appreciate it very much if you could let me know I should get those 4 ordinal variables dichotomized or not. Many thanks,
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