Date: Tue, 29 Mar 2005 11:07:16 -0800
Sender: "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From: "David L. Cassell" <cassell.david@EPAMAIL.EPA.GOV>
Subject: Re: Correlation between MAT Score v/s GPA
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srihari swamynathan <email@example.com> replied:
> On Tue, 29 Mar 2005 David L.Cassell wrote :
> >I see that Wensui Liu has already given you some excellent advice.
> >Depending on what your hypothesis really is, PROC CORR may be the
> >answer, and it may not. What do you mean? Here are three different
> >options you might be contemplating. Note that they are VERY
> >1 "MAT and GPA rise together linearly."
> >2 "MAT and GPA rise together, but not necessarily linearly."
> >3 "If MAT goes up, then GPA goes up too."
> >Option 1 is a linear correlation. This looks like PROC CORR with
> >Pearson correlation.
> >Option 2 is a monotonic relationship. As Wensui noted, now you're
> >into the realm of Spearman correlations.
> >Option 3 is not correlation at all, but causality. You CANNOT
> >this using correlations. In fact, you cannot attribute causality
> >only statistics, no matter what.
> >So again I ask, what do you mean? What is your underlying
> well, my hypothesis is to show that the MAT score has a significant
> effect on GPA. In simpler terms, one who is scoring good marks in
> MAT has a higher GPA than who doesnt have.
I'm sorry, but you need to quantify that a bit more. Can you state your
hypothesis numerically? Statistically? Are you assuming causality or
Your response is still too vague for me to tell *exactly* what you mean.
David Cassell, CSC
Senior computing specialist