Re: st: combination of observations

["Nikolaos A. Patsopoulos" <npatsop@cc.uoi.gr>]

n j cox wrote:

> You are using Stata 8.0. You, or your systems administrator,
> should -update- to Stata 8.2. It is free.
>
> -comb()- is not implemented as an .ado file. It is a Stata function,
> not a command or program. All Stata functions are implemented as
> part of the executable and not visible to users.
>
> That said, I am not clear precisely what your problem is, but -tuples- 
> on SSC, or the code therein, may help.
>
> Nick
> n.j.cox@durham.ac.uk
>
> Nikolaos A. Patsopoulos
>
> for n observations list by combinations of k. if we set n=4 and k=2 
> for the
> following dataset we should get:
>
> Dataset: var1: [1] A [2] B [3] C [4] D
>
> AB
> AC
> AD
> BC
> BD
> CD
>
> Actually insetad of list I want to run another program but the logic 
> is the same.
>
> Have tried to find sth like this but the comb() function only gives 
> the number
> of combinations. Some programs I found cpr (Cox) and byvar (Royston) do
> combinations for a given set of number (max=5).
>
> Is there a way I can do this in STATA (version 8.0)?
>
> At least does anyone knows where I can one find the ado of comb()? I 
> look into
> my STATA and ado folders but it must have a different name.
> *
> * For searches and help try:
> * http://www.stata.com/support/faqs/res/findit.html
> * http://www.stata.com/support/statalist/faq
> * http://www.ats.ucla.edu/stat/stata/
-tuples- is near enough to what I want to do, so I'm going to play a bit 
with it's code.

Thanks!

Nikos

*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/