I would like to compare two different groups of prisonners on a psychopathy test (PCL-R, for those who like to know). One has been evaluated on the basis of an interview as well as on the basis of their personal and correctional files. The second group has only been evaluated on the basis of their correctional file. I would like to compare the number of times or the proportion that a certains ratings occurs (presence of a psychopathic characteristic). Say, I want to know if, both groups being similar, we have a tendency to rate subjects differently, with these two different methods. For exemple, one of the characteristics is "lying". I would like to know if there are significant differences etween the ratings of these two groups. What are the proportions of subjects rated as "lying". If in the first group it's 50% and in the second 30%, what test should I use to know if these differences are significant? How can I compare these two independent groups, in such a "parallel" design? I've heard that Joseph L. Fliess discusses that question in his "The design and analysis of clinical experiment" book, but I just can't figure out where... Sorry again for my poor english... Bonne journ�e Jean-Pierre Sent via Deja.com http://www.deja.com/ Before you buy. =========================================================================== This list is open to everyone. Occasionally, less thoughtful people send inappropriate messages. Please DO NOT COMPLAIN TO THE POSTMASTER about these messages because the postmaster has no way of controlling them, and excessive complaints will result in termination of the list. For information about this list, including information about the problem of inappropriate messages and information about how to unsubscribe, please see the web page at http://jse.stat.ncsu.edu/ ===========================================================================
