Correlation and Difference Scores

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Correlation and Difference Scores

Shawn Hales

Hello All,

I wanting some feedback on whether the following is problematic:

I wanted to discover the interaction between the personality traits of teachers/tutors and their students success on academic measures.

I have pre-tutoring and post-tutoring grade levels from a well-normed academic test.  I created a Difference score by subtracting time 1 from time 2.  I then correlated the teacher/tutor scores from measures of "patience" and "volunteer experience" with these difference scores. 

What problems could result in this set up?  Would the correlation be successful?

Shawn Hales, Psy.D.

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