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st: nested calculations
From
Fabio Zona <[email protected]>
To
[email protected]
Subject
st: nested calculations
Date
Thu, 2 Dec 2010 22:04:21 +0100 (CET)
Hi All,
I have another little problem: promise it is the last one for today!
I have the list below. For each firm, I have to calculate the standard deviation for every variable (e.g., for Var 1) referring to the 4 quarters of each year!
Below you find both the starting matrix and the expected one.
Please, help! (I think this might be easier)
STARTING MATRIX OF VAR/OBS
firm year quarter Var1 Var2
1 1 1
1 1 2
1 1 3
1 1 4
1 2 1
1 2 2
1 2 3
1 2 4
1 3 1
1 3 2
1 3 3
1 3 4
2 1 1
2 1 2
2 1 3
2 1 4
2 2 1
2 2 2
2 2 3
2 2 4
2 3 1
2 3 2
2 3 3
2 3 4
EXPECTED MATRIX OF VAR/OBS
firm year stddev_Var1
1 1 number
1 2
1 3
2 1
2 2
2 3
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