If you have sample data, and only want standard deviation for the sample, without extrapolating for the entire population, use the STDEV.P function.
If you have an appropriately large sample and you want to approximate standard deviation for the entire population, use the STDEV.S function.If you have data for an entire population, use STDEV.P.When should you use STDEV.S, which includes Bessel’s correction? It depends. The STDEV.S function uses Bessel's correction.In the context of Excel and standard deviation, the key thing to know is: When working with a sample population, Bessel's correction can provide a better estimation of the standard deviation. It appears in formulas as n-1, where n is the count. However, when you calculate statistics for a sample, results are estimates and therefore not as accurate.īessel's correction is an adjustment made to correct for bias that occurs when working with sample data. When you calculate statistics for an entire population (mean, variance, etc.) results are accurate because all data is available. IF the data is just a sample, and you want to extrapolate to the entire population, you can use the STDEV.S function to correct for sample bias as explained below. If the data represents the entire population, you can use the STDEV.P function. To calculate standard deviation in Excel, you can use one of two primary functions, depending on the data set. Standard deviation is a measure of how much variance there is in a set of numbers compared to the average (mean) of the numbers.
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