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st: rsd vs. summarize


From   "Olga Gorbachev Melloni" <olga_gorbachev@hotmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: rsd vs. summarize
Date   Mon, 07 Aug 2006 18:13:57 -0400

Hello,

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,
Olga


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