Hello Marshall,

On Jan 17, 2012, at 3:38 PM, Victor Yankee wrote:

...

How can I calculate the Sample Standard Deviation over a std::vector of doubles using accumulators?

Or is there a faster way in boost math or some such?

Google is your friend (second hit for "boost accumulator standard deviation"):

http://stackoverflow.com/questions/7616511/calculate-mean-and-standard-devia...

and http://stackoverflow.com/questions/4316716/is-it-possible-to-use-boost-accum...

accumulator_settag::variance > acc; for_each(a_vec.begin(), a_vec.end(), bind<void>(ref(acc), _1));

cout << mean(acc) << endl; cout << sqrt(variance(acc)) << endl;

But this is the POPULATION standard deviation (variance divided by N) I think. What I was asking for was how to calculated the SAMPLE standard deviation (variance devided by N-1). Thanks, Vic