RE: correcting for chance

[Manza, Louis]

Patrick:   A student has conducted 2 memory experiments and she would like to compare performance across the two (at least roughly).    The problem is that 1 of them was a 2-alternative forced choice test  and the other is 3-alternative forced choice test (both were judgments of relative recency).  Chance performance being substantially different between the two, a direct comparison isn't appropriate.   Does anybody have a suggestion to correct for chance?  I thought of simply subtracting chance from each subject's score but I didn't know if that is acceptable or if there is a better idea.   How about converting the raw scores into z-scores, and then comparing the z-scores across the 2 studies?   Cheers,   Lou   ----------------------------------------------------------------------- Dr. Lou Manza                              Associate Professor of Psychology    Lebanon Valley College                                         Annville, PA 17003                       Phone: (717) 867-6193 Fax: (717) 867-6075  E-Mail: [EMAIL PROTECTED]   "Living in the limelight, the universal dream, for those who wish to seem.  Those who wish to be must put aside the alienation, get on with the fascination, the real relation, the underlying theme."   RUSH, "Limelight" -----------------------------------------------------------------------   --- You are currently subscribed to tips as: [EMAIL PROTECTED] To unsubscribe send a blank email to [EMAIL PROTECTED]