correlate to v/s correlate with

[sk]

In a MGMAT test that I gave, I found a question in SC on correlate to v/s correlate with. Can anyone please clarify when to use which?

[esledge]

I didn't find a definitive answer on this one.

The dictionary I have handy (Random House College Dictionary, 1982) uses the phrase "found in correlation with another" to define the adjective "correlative."

A Google search reveals both usages, though to me "X correlates with Y" not only sounds better than "X correlates to Y," but also seems more metaphorically appropriate (X and Y increase and decrease with each other, assuming positive correlation).

Incidentally, here are some related idioms I ran across:
X is in correlation with Y
X and Y are in correlation
X and Y correlate with each other.
X and Y correlate to some degree. (I think this is different from "X correlates to Y," as the "to" in this case belongs with "some degree")

[fcomorales]

More evidence about this:

The OG12 and the Verbal Review Ed. 2 do not use "correlate to" or "correlates to" in the verbal section. They do use "correlate with" and "correlates with". I did this search using Google Books.

[tim]

thanks!