reliability, scale scores in the psych package

Ista Zahn · 2009-03-10T14:45:37Z

> Second question: I spent some time with the psych package trying to > figure out how to use the score.items() function, and it's become > clear to me that I don't understand what it's doing. I assumed that > setting a key equal to -1 would result in the item being reverse > scored, but I get weird results, as shown below. When I try to reverse > score (by setting a value of -1 in the key), I get scale scores that > don't add up (e.g., the mean score is reported as being larger than > th

Ista Zahn

Tue, Mar 10, 2009 7:45 AM

<snip>

I did it again--it seems like I always figure out the answer just
after I ask for help. The score.items() function needs to know the
maximum of the scale in order to reverse score. For some reason, the
maximum appears to be calculated from all the scores, not just scores
that have a 1 or a -1 in the key. On a hunch I set the max argument to
a vector of scale maxima, and it worked. I'm still interested in
responses to question 1 though.

Thanks again,
Ista

<snip>

Thread (5 messages)

Ista Zahn reliability, scale scores in the psych package Mar 10 Ista Zahn reliability, scale scores in the psych package Mar 10 Doran, Harold reliability, scale scores in the psych package Mar 10 William Revelle reliability, scale scores in the psych package Mar 10 Ken Knoblauch reliability, scale scores in the psych package Mar 10