'Error: Must subset columns with a valid subscript vector
I'm trying to find the reliability of some items, using itemAnalysis(). My data sample consists of 24 items on a Likert scale, with 50 samples.
I keep getting the same Error, see picture:
This is the simple code that is supposed to work:
itemAnalysis(Mindset[,1:24])
What can I try to solve this problem?
Sources
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