bysort ID (year) : gen cusum = _N - _n + 1
Nick
[email protected]
Alexander Nervedi
> I am looking to implement a group level cumulative sum that
> starts counting
> backwards. Any suggestions on how to go about this would be
> really useful
>
> data example:
> ID year num cusum
> 1 90 1 2
> 1 91 1 1
> 2 90 1 4
> 2 91 1 3
> 2 92 1 2
> 2 93 1 1
> 3 90 1 1
> 4 90 1 2
> 4 90 1 1
> ...
>
> I have variables ID year and num, and am trying to create cusum
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