Re: st: Question on -Areg- command

[lena Lindahl <lena.Lindahl@sofi.su.se>]

Excellent!
Many thanks
/Lena

smerryman@kc.rr.com wrote:
> -areg- was updated 17jun2005 
> "1.  areg failed when attempting to fit a constant-only model.  This 
> has been fixed."
>
>
> Is your Stata up to date? Try -update query-
>
> -areg- without any RHS variables works fine for me:
>
> . sysuse auto
> (1978 Automobile Data)
>
> . areg mpg ,ab(rep)
>
> Linear regression, absorbing indicators                Number of obs 
> =      69
>                                                        F( 0, 64)     
> =       .
>                                                        Prob > F      =
>                                                        R-squared     
> =  0.2348
>                                                        Adj R-squared 
> =  0.1869
>                                                        Root MSE      
> =  5.2897
>
> -----------------------------------------------------------------------
> -------
>          mpg |      Coef.   Std. Err.      t    P>|t|     [95% Conf. 
> Interval]
> -------------+---------------------------------------------------------
> -------
>        _cons |   21.28986   .6368064    33.43   0.000     20.01769    
> 22.56202
> -------------+---------------------------------------------------------
> -------
>        rep78 |          F(4, 64) =      4.909   0.002           (5 
> categories)
>
>
>
> Scott
>
> ----- Original Message -----
> From: lena Lindahl <lena.Lindahl@sofi.su.se>
> Date: Thursday, February 2, 2006 6:13 am
> Subject: st: Question on -Areg- command
>
>   
> > Hi!
> > I have a question on the -Areg- command.
> > In the STATA manual it is used in the following example:
> >
> > areg mpg gratio, absorb(rep78).
> >
> > I would like to run a regression with a very large amount of dummy 
> > variables.
> > Using the example, I would like to run the regression without the 
> > right 
> > hand side variable, gratio, and so only estimate the effect of the 
> > absorbed dummy variables represented by rep78. (I am only 
> > interested in 
> > the adj R2 value.) But it is not possible to leave out variable 
> > gratio, 
> > the error message states  "varlist required".
> >
> > Anyone who has an idea?
> >
> > All the best/
> > Lena
> >
> >     
> *
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>   

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