I noticed that Stratasearch calculates the POPULATION standard deviation, by default. Would you consider adding the SAMPLE standard deviation as well? Since we are often only working with a limited subset of the data series, SAMPLE statistics may be more appropriate in those cases.

The new formulas could be:

sdevp() for population standard deviation ... stdev() would default to sdevp() to handle legacy code

sdevs() for sample standard deviation

In the meantime, the workaround would be to back-out and re-arrange the POPULATION standard deviation in order to obtain the SAMPLE standard deviation, like this:

sqrt((sqr(sdev(close,N))*N)/(N-1))

> where N is the sample size

> replace "close" with any value of interest