Cronbach's Alpha and proc corr and Type of variables

[Belinda01]

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,

[MikeStockstill]

Hello Belinda01-

Here is a link to a paper that might be useful for you.

https://support.sas.com/resources/papers/proceedings14/2042-2014.pdf 

The authors state that the paper discusses and gives SAS code to estimate reliability for ordinal data.

Have a great day.