opPow, opDollar

[dsimcha]

== Quote from Robert Jacques (sandford at jhu.edu)'s article
> I'd recommend rolling that into a basic statistics struct containing
> common single pass metrics: i.e. sum, mean, variance, min, max, etc.

I've been wondering for a while if something like this is general enough for
non-statisticians and a good candidate for Phobos:

http://svn.dsource.org/projects/dstats/docs/summary.html

Good?  Overkill?  Too niche?