RE: st: -foreach- loop to fit regression at each level of a variable

[Joe Canner <jcanner1@jhmi.edu>]

Milena,

No one expects you to read 11000 pages of documentation, just the ones relevant to your problem, in this case -foreach- and -levelsof-.

In any case, if you are still having problems you should provide us both with the current code you are running and tell us exactly what happens when you run it (e.g., are there errors?  Nothing happens?  Wrong answers? etc.).

Regards,
Joe Canner

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Milena Przheska
Sent: Tuesday, November 19, 2013 8:38 AM
To: statalist@hsphsun2.harvard.edu
Subject: Re: st: -foreach- loop to fit regression at each level of a variable

With all due respect, I doubt that everyone that posts a question has read all 11000 pages of documentation.

I felt overwhelmed, so I asked for help.

And by the way, even with all the syntax correct, I don't get any estimates, which was the essence of my question.



On Tue, Nov 19, 2013 at 2:27 PM, Nick Cox <njcoxstata@gmail.com> wrote:
> My point was that I had already explained why -foreach- with -of- did 
> not work without a key word indicating list type. Also, the specific 
> FAQ referred to does explain at length how to approach exactly your 
> problem.
>
> The Statalist FAQ does underline an expectation that people do try to 
> read the documentation.
>
> Nick
> njcoxstata@gmail.com
>
>
> On 19 November 2013 13:10, Milena Przheska 
> <milena.przheska@cosmicdevelopment.com> wrote:
>> Nick,
>>
>> Judging by your tone I realize I have wasted your patience, but my 
>> question was whether it is even possible to do what I wanted, because 
>> I just wanted to know whether I am on the right path, or trying 
>> something that Stata cannot accept.
>>
>> In any case, thank you for your reply.
>>
>> On Tue, Nov 19, 2013 at 1:57 PM, Nick Cox <njcoxstata@gmail.com> wrote:
>>> Please read the whole of my reply and the FAQ referred to.
>>>
>>> Nick
>>> njcoxstata@gmail.com
>>>
>>>
>>> On 19 November 2013 12:47, Milena Przheska 
>>> <milena.przheska@cosmicdevelopment.com> wrote:
>>>> Yes, I fixed that with the following:
>>>>
>>>>
>>>> levelsof sample, local(sample_levels)
>>>>
>>>> but the -foreach- still does not work
>>>>
>>>>
>>>> On Tue, Nov 19, 2013 at 1:43 PM, Nick Cox <njcoxstata@gmail.com> wrote:
>>>>> Also, there is no legal syntax
>>>>>
>>>>> -egen local-
>>>>> Nick
>>>>> njcoxstata@gmail.com
>>>>>
>>>>>
>>>>> On 19 November 2013 12:42, Nick Cox <njcoxstata@gmail.com> wrote:
>>>>>> Just looking at the help for a few seconds establishes that
>>>>>>
>>>>>> 1. There is no -levelsof()- function for -egen-.
>>>>>>
>>>>>> 2. -foreach ... of- requires a key word specifying a list type to follow.
>>>>>>
>>>>>> Also you should learn in type in Stata
>>>>>>
>>>>>> . search foreach
>>>>>>
>>>>>> to find resources. In this case,
>>>>>>
>>>>>> http://www.stata.com/support/faqs/data-management/try-all-values-
>>>>>> with-foreach/
>>>>>>
>>>>>> is most focused on your problem.
>>>>>>
>>>>>> Nick
>>>>>> njcoxstata@gmail.com
>>>>>>
>>>>>>
>>>>>> On 19 November 2013 12:34, Milena Przheska 
>>>>>> <milena.przheska@cosmicdevelopment.com> wrote:
>>>>>>
>>>>>>> I am trying to fit the same logistic regression model using 
>>>>>>> different samples from a data set and I am wondering if it is 
>>>>>>> even possible to use a -foreach- loop to estimate regression 
>>>>>>> models for each sample (indicated by a variable).
>>>>>>>
>>>>>>> I use the variable 'sample' to indicate the sample, but instead 
>>>>>>> of writing the command over and over for each sample, I tried to 
>>>>>>> do this with a -foreach- loop, something  like this:
>>>>>>>
>>>>>>> egen local sample_level = levelsof(sample)
>>>>>>>
>>>>>>> foreach n of sample_level {
>>>>>>> logistic outcome var1 var2 var3 if sample_level==`n', 
>>>>>>> vce(cluster id) }
>>>>>>>
>>>>>>> As always, I would appreciate your help.
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