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Difference between STDEV & STDEVP

    Question

  • Can somebody please compare these 2 functions for me and explain with an example?

    Thank You

    Tuesday, April 11, 2006 4:59 PM

Answers

  • You can find detailed description here (the second article has an example):

    http://office.microsoft.com/en-us/assistance/HP010322691033.aspx

    http://www.beyondtechnology.com/tips016.shtml

    Quote:

    • 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 ). Technically, subtracting the 1 is referred to as "non-biased."

    • STDEVP is used when the group of numbers being evaluated is complete - it's the entire population of values. In this case, the 1 is NOT subtracted and the denominator for dividing the sum of squared deviations is simply N itself, the number of observations ( a count of items in the data set ). Technically, this is referred to as "biased." Remembering that the P in STDEVP stands for "population" may be helpful. Since the data set is not a mere sample, but constituted of ALL the actual values, this standard deviation function can return a more precise result.

     

    Tuesday, April 11, 2006 9:25 PM