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st: how do you subtract the value of one group from the value of another group?


From   Ken Ning <[email protected]>
To   [email protected]
Subject   st: how do you subtract the value of one group from the value of another group?
Date   Mon, 19 Aug 2013 20:43:42 +0100

Hi statausers

how do you subtract the value of one group from the value of another group?

e.g. if i want to substract the value of group 2 (value= 11 in 2001
and 12 in 2002) from group1 (value= 7 in 2001 and 8 in 2002) year by
year? so this needs to be 11-7 and 12-8 and listed next to the value
of group 2



id year value  (minus value)
1 2001   7     .
1 2001   7    .
1 2001   7   .
1 2002    8  .
1 2002    8  .
1 2002    8  .

2 2001   11     x (need to get)
2 2001   11     x
2 2001   11     x
2 2002   12     x
2 2002   12     x
2 2002   12     x

Many thanks
Ken
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