[gwd]

I've heard of these types of statistical analyses before, but they always sounded a bit suspicious to me. Have they been verified on known datasets? i.e., if I used your fathers techniques on your comment history, would it find that it was authored by a single person, or would it think there was a committee of you?

[ggm]

https://en.m.wikipedia.org/wiki/Stylometry is as good a reference as any to the methodologies. I know pointing people at Wikipedia is a bit passé but it gives a good summary.

I think the answer to your implied criticisms would be, "it depends"