SQL - STDEVP or STDEV and how to use it?
I have a table: LocationId OriginalValue Mean 1 0.45 3.99 2 0.33 3.99 3 16.74 3.99 4 3.31 3.99 and so forth... How would I work out the Standard Deviation using this table and also what would you recommend - STDEVP or STDEV ? To use it, simply: SELECT STDEVP(OriginalValue) FROM yourTable From below, you probably want STDEVP . From here : STDEV is used when the group of numbers being evaluated are only a partial sampling of the whole population. The denominator for dividing the sum of squared deviations is N-1, where N is the number of observations ( a count of items in the data set ).