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Re: st: gen a newvar


From   Ronán Conroy <rconroy@rcsi.ie>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: gen a newvar
Date   Mon, 14 Mar 2005 17:18:14 +0000

Hans J. Baumgartner wrote:

Dear Statalist,

this may sound like a very silly question. But I seem to be unable to
solve it anyway.


My data looks like this:

id      x
1       5
1       5
1       10
1       10
1       21
1       21
1       21
2      ...

I want to generate a newvar with the maximum value of x , which is _N.
But if the difference between the largest and the second largest value
is <=7, newvar should take the value of the second largest value of x.

No single step solution, but

by id:gen max_x=x[_N]
by id:replace max_x=x[_N-1] if (x[_N] - x[_N-1]) <=7



--

Ronan M Conroy (rconroy@rcsi.ie) Senior Lecturer in Biostatistics Royal College of Surgeons Dublin 2, Ireland +353 1 402 2431 (fax 2764) -------------------- Just say no to drug reps http://www.nofreelunch.org/

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