Standard Deviation Rollup - Population and Sample Equations

Hey Tada Gang-

I have encountered a need for an application to use one of the two different types of Standard Deviation calculations. The current one that is included in the application is that of a population formula (Count or “n”). I have a need for the sample formula. (Count - 1 or “n”-1)

You can see the difference here:

Would it be possible to create a second STDEV selection for the sample formula? This formula is the same in all but the N-1 (Count - 1) factor.