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Re: st: Help with mathematical operation


From   Jeph Herrin <junk@spandrel.net>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Help with mathematical operation
Date   Thu, 10 Sep 2009 15:37:25 -0400

If I understand correctly (and x is your variable):

  expand _N
  bysort x : gen id=_n
  bysort id (x) : gen y=x[id]
  gen xy = x*y

will do it.

hth,
Jeph



Burnett, Tim wrote:
Hello,

I am at the end of my tether with Stata 10 and was hoping someone could help me:

I have a dataset which I am trying to manipulate:

Assuming the following variable:

1
2
3
4
5
6
7
8

I am trying to create a variable which will show:

1*1
1*2
1*3
1*4
.
.
.
2*1
2*2
2*3
2*4
.
.
.
...and so on.


I really don't know where to look as I can't think what this mathematical operation would be called. Maybe I'm just dim.

Many thanks,

Tim Burnett

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