SEM is the standard deviation of the sample-mean estimate of a population mean.

SEM is calculated by taking the standard deviation and dividing it by the square root of the sample size. In Excel, this is calculated using the following formula:

**=stdev(range)/sqrt(count(range))**

## 10 comments:

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Thank you man!!

I also want to thank you! I do not understand why Excel does not have this function.

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what is the sample size

In this case, it refers to the number of values (or cells). That is what the count function is doing. E.g., count(A1:C1) would be a sample size of 3.

Excel does include sqrt of (n-1) in the calculation of the STDEV. Is that not the standard error of the mean?

From this webpage

https://support.office.com/en-us/article/STDEV-function-51fecaaa-231e-4bbb-9230-33650a72c9b0

STDEV uses the following formula:

Formula sqrt(sum(x-x(bar))^2/(n-1))

where x is the sample mean AVERAGE(number1,number2,…) and n is the sample size.

In Excel, STDEV is the standard deviation of the sample (calculated using n-1), whereas STDEV.P is the standard deviation of the population (calculated using n). Neither of these is the standard error of the mean.

Bafflingly, there is no function in Microsoft Excel to calculate standard error of the mean.

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