On 15 Jan 2003 07:09:49 -0800, [EMAIL PROTECTED] (Dennis Roberts) wrote: >just as an example ... say you had a null hypothesis that the population >correlation was 0 ... (this is typical for the null) and ... you had a >sample size of about 1000 ... it would only take an r of about .06 ... for >you to reject the null ... however, do you think that accounting for .06^2 >... = ..0036 or less than 1% of the criterion variance ... is enough such >that you would be willing to use X (which might be data that is costly to >collect) as a predictor of Y?
Agreed. But there might be circumstances where even small correlations provide important information and justify certain actions. If the 0.06 correlation comes from a death rate of 250 out of 500 in one treatment and 220 out of 500 in the other treatment... Regards Michael . . ================================================================= Instructions for joining and leaving this list, remarks about the problem of INAPPROPRIATE MESSAGES, and archives are available at: . http://jse.stat.ncsu.edu/ . =================================================================
