predictive validity and scales of measurement

[Rick Froman]

I recently read a claim that HS rankings might be better predictors of first year college GPA than HS GPA because of differences in grading standards at various high schools. This sounds reasonable but because rank is based on HS GPA, it is basically like taking interval data and converting it to ordinal data. Usually, you would think that using a lower scale of measurement would result in the loss of information that would decrease the predictive power of the variable. Does anyone have any idea if such rankings could be better predictors than the interval data on which they were based?   Rick   Dr. Rick Froman Associate Professor of Psychology John Brown University Siloam Springs, AR 72761 (479) 524-7295 e-mail: [EMAIL PROTECTED] web: http://www.jbu.edu/academics/sbs/rfroman.asp   --- You are currently subscribed to tips as: [EMAIL PROTECTED] To unsubscribe send a blank email to [EMAIL PROTECTED]