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st: FW: generate observations by group/levels


From   "Rajesh Tharyan" <[email protected]>
To   <[email protected]>
Subject   st: FW: generate observations by group/levels
Date   Sun, 20 May 2007 15:44:21 +0100

________________________________________
From: Rajesh Tharyan [mailto:[email protected]] 
Sent: 20 May 2007 15:37
To: '[email protected]'
Subject: generate observations by group/levels 

Hi all,


I am trying the do the following. If I have a data set which looks like this

Co� ��year
A���� �1986
A����� 1999
B����� 1987

I want to say increase the observations for each company year by any number
of years I specify. Lets assume expanding by two years.

So the resulting dataset will look like

Co year

A 1986
A 1987
A 1988
A 1999
A 2000
A 2001
B 1987
B 1988
B 1989

I cant set obs or expand by a grouping variable.� I was then trying to split
each file into several files first based on levels of co and then levels of
year, then expand , fillinin missing values etc. But that route is making
the process unnecessarily complicated (I think)

Is there a more staright forward way to do this

Any help is valuable

Thanks 
rajesh




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