RE: st: Summarizing properties of other group members meeting specified conditions

[Erik Aadland <erikaadland@hotmail.com>]

Thank you so much for your help and input, Nick. I sincerely appreciate it.
 
When testing the suggested code, after having sorted on project_id and org_id, I get an error message for the following line of code:
 
quietly forvalues i = 1/`r(max)' {

The error message is:
 
1 invalid name
r(198);

How to get around this problem?
 
 
Kind regards,
 
Erik Aadland.
 
 


> Date: Tue, 28 Jun 2011 08:20:57 +0100
> Subject: Re: st: Summarizing properties of other group members meeting specified conditions
> From: njcoxstata@gmail.com
> To: statalist@hsphsun2.harvard.edu
> 
> There was another typo in the line I corrected (you can't have two
> -if-s) and it is not clear where your r(max) comes from. This may be
> closer, but I've not tested it.
> 
> gen maxwins = .
> su org_id, meanonly
> quietly forvalues i = 1/`r(max)' {
> gen include 1 = if org_id != `i' & cond_1 == 1
> egen x = max(var_2 * include) if cond_2 == 1, by(project_id)
> replace maxwins = x if org_id == `i'
> drop include x
> }
> 
> 
> 
> On Mon, Jun 27, 2011 at 3:26 PM, Erik Aadland <erikaadland@hotmail.com> wrote:
> > Dear statalist.
> >
> > After having read the following FAQ http://www.stata.com/support/faqs/data/members.html and experimented with solutions, I am still struggling.
> >
> > For each project_id, I am trying to generate a variable that for each org_id that meets a specified condition generates the highest observed value on a given variable for another org_id that meets a different specified condition. I think an example is in order:
> >
> > Example structure:
> >
> > project_id org_id cond_1 cond_2 cond_3 var_1 var_2
> > 1 1 0 1 0 3 0
> > 1 2 1 0 0 0 3
> > 1 3 0 0 1 0 1
> > 2 4 0 1 0 2 0
> > 2 4 1 0 0 0 4
> > 2 5 1 0 0 0 3
> > 2 6 0 1 0 1 0
> > 3 8 0 1 0 1 0
> >
> >
> > For instance, for each project_id I try generate a variable that for each org_id meeting cond_2 == 1 produces the highest value of var_2 for org_id that meets cond_1 == 1. In the case of project_id 1 above org_id 1 should get a score of 3, while org_id 2 and 3 should get a missing value. Some project_ids may have only one observation (consist of a single org_id) as in project_id 3 above, or may not have other org_ids represented that meet the specified condition. Then, it is of course not possible to generate a value on the variable.
> >
> > I have tried with the following code, but I cannot figure out how to specify cond_2 == 1, and it comes out all wrong (Stata does not even accept my code):
> >
> > sort project_id org_id
> > gen maxwins = .
> > quietly forvalues i = 1/`r(max)' {
> > gen include 1 = if org_id != `i' if cond_1 == 1
> > egen x = max(var_2 * include), by(project_id)
> > replace maxwins = x if org_id == `i'
> > drop include x
> > }
> >
> > Is it possible to do this without loops also?
> 
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