and, with, for

I heard a story on NPR last week about some scientists or scholars who have created a computer program that can determine whether a piece of writing was created by a man or a woman.

Apparently, regardless of what they are writing about, women use the words "and," "with," and "for" more often than men, in a statistically significant way. Men's writing, on the other hand, tends to show a predominance of "of."

Dialog can skew the result, and so may be omitted from a sample.

Here's a link to listen to the audio....
http://discover.npr.org/features/feature.jhtml?wfId=1383493