Two indices share the same variable

[Cheng YuanLung]

I have two indices, A and B, and they share a variable, age.
Is there any way that I can determine the positive correlation of A with B has nothing to do with the age variable in Stata.

Thank you.

[Clyde Schechter]

Sounds like you want the partial correlation of A and B, partialing out age. -help pcorr-

pcorr A B age

[Cheng YuanLung]

Is there difference between Pearson and Spearman when I use the 'pcorr' command?
I couldn't find it in the reference manual.

Thank you very much.

[Nick Cox]

pcorr gives a Pearson-type correlation. If you want a Spearman-type analogue, I think you need to rank your variables first and feed the ranks to pcorr. Bets are off on whether that is a really useful thing to do.