std function

[Amalik]

Hi,

I have a data as follows and want to create a separate file/ column ,calculating standard deviation of var1 by permno winid and month, any suggestions on how to go about it?

permno	winid	date	month	var1
1	1	1-Jan-00	Jan-00
1	1	….31jan00	Jan-00
1	2	2-Feb-00	Feb-00
1	2	….28-feb00	Feb-00
2	3	1-Jan-00	Jan-00
2	3	….31jan00	Jan-00
2	4	2-Feb-00	Feb-00
2	4	….28-feb00	Feb-00

[pau13rown]

proc univariate data=;

var var1;

by permno winid month;

output out=std std=std;

run;

?