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Re: st: OLS regression in STATA - missings


From   "Joao Ricardo F. Lima" <jricardofl@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: OLS regression in STATA - missings
Date   Sun, 5 Oct 2008 09:39:46 -0300

Ops, this is correct:

If your first observation in the database is 1977, you are trying to
 run an ols with only one observation, WITHOUT degree of freedom.

2008/10/5 Joao Ricardo F. Lima <jricardofl@gmail.com>:
> Dear Bastian,
>
> is this a time series? What is the range? Do you tsset the data?
> Before use the looping, you need to see if the command run. This
> command run?
>
> reg dependent_var indep_var1 indep_var2  if Observation_Year <= 1977,
> robust cluster (firms)
>
> If your first observation in the database is 1977, you are trying to
> run an ols with only one observation, with degree of freedom.
>
> I think you need to provide us more information.
>
> Hope this helps,
>
> Joao Lima
>
> 2008/10/5  <Steingros@gmx.de>:
>> Dear Stata users ,
>>
>> I am using this command to run a OLS regression:
>>
>> forvalues i=1977/2007 {
>> reg dependent_var indep_var1 indep_var2  if Observation_Year <= `i', robust cluster (firms)
>> }
>>
>> However, STATA displays in this case "no observations" and  it is not possible to run the regression.
>>
>> For instance, in 1980, I have observations of the second independent variable and the dependent variable  only, but I thought that STATA would ignore this year and continue the regression in 1981 instead. Obviously, it is not the case!
>>
>> So what should I do about this problem ? Any ideas???
>>
>> Thank you very much !
>>
>> Bastian S
>> --
>> Psssst! Schon vom neuen GMX MultiMessenger gehört? Der kann`s mit allen: http://www.gmx.net/de/go/multimessenger
>> *
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>>
>
>
>
> --
> -------------------------------
> Joao Ricardo Lima
> Professor
> UFPB-CCA-DCFS
> +553138923914
> -------------------------------
>



-- 
-------------------------------
Joao Ricardo Lima
Professor
UFPB-CCA-DCFS
+553138923914
-------------------------------

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