Hi all. Just a quick Q for anyone with a stats head on them. Am I breaking any statistical rules by correlating variables in the following way. Say the letters are all representative of scores on different aptitude tests. We have tests A, B, C, X, Y, Z, so:

The correlation of X with the sum of A, B, C, X, Y and Z.

The bits that concern me are correlating X with itself, and correlating X with the sum of all the other variables.

Hope I've explained that clearly enough.

Cheers,
DH