Hey all,

I have the following problem. I would like to calculate rolling standard deviation of the past returns of the 36 months in a panel data.I tried using he following code:
rangestat (sd) ret, interval (datem -36 -2) by (permno)

However, when looking at the output that Stata has generated, I can see that the standard deviation is calculated even if the number of observations equals two.

I would like to ask for your recommendation how to indicate that I would like Stata to generate the standard deviation when the number of observations equals one.

Thank you in advance!

Nick Cox