I'm calculating the Cronbach's alpha on a dataset with the scores of the Coping Orientations to the Problems Experienced (COPE-NVI-25) with the R package
psych. I used the following code:
But got this error:
Some items ( COPE.5 COPE.19 COPE.22 ) were negatively correlated with the total scale and probably should be reversed.
The items have already been correctly reversed when necessary, so I suppose that I have to identify and exclude some careless responders. How I can do that?