[Date Prev][Date Next][Thread Prev][Thread Next][Date index][Thread index]
st: rsd vs. summarize
I have a potentially silly question, so I apologize in advance.
I am trying to compute standard deviation of income for each person over 5
year time period (specifically, it is a 5 year rolling standard deviation
for each person in the panel).
When I do this by collecting standard deviations reported by summary command
through 'rolling', they are slightly different but sometimes even move in
different directions, when compared to standard deviations computed using
rsd (row standard deviation -- used after creating lags of income data for
each person) -- and it is not due to missing observations, I checked that.
Do you have any idea why there is a difference and if so what is it?
Thank you in advance,
* For searches and help try: