st: RE: special sum

["Nick Cox" <n.j.cox@durham.ac.uk>]

Depending on what your subscripts mean, this 
could be the sum given by the -sum()- 
function or the sum given by -egen, rsum()-. 

See the results of 

. help sum()

and 

. help egen 

Nick 
n.j.cox@durham.ac.uk 

abdelrahmen.ellahga@gnet.tn
 
> I have a variable xi and I wish to generate a new variable
> 
> yi=sum(xj) for j=(1)...(i-1)
 

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