#### Howdy, Stranger!

It looks like you're new here. If you want to get involved, click one of these buttons!

Supported by

# Standard deviation of the population (rather than sample)?

Hi JASP people,

A question about the descriptive statistics given by JASP. I have a small data set for which I'd like to calculate the standard deviation. JASP seems to treat the data as a sample and gives the sample standard deviation.

But my data set is not a sample, it's the whole population. How can I get the standard deviation of this population? Something like the STDEV.P function in Excel is what I'm looking for.

Any ideas?

Beginner

• So you want to divide by N instead of N-1, is that what you mean?

If I'm not mistaken you can take the SD from JASP, multiply by [sqrt(1/N) / sqrt(1/(N-1))] and you should get the result you want. I did this very quickly though, so best to check!

Actually this works out for your examples:

(sqrt(1/5) / sqrt(1/(5-1))) * 1.58 = 1.413195

and

(sqrt(1/5) / sqrt(1/(5-1))) * 2 = 1.788854

Cheers,

E.J.