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Re: st: factor variables and pweights not accepted in qreg Stata v13
From
Joerg Luedicke <[email protected]>
To
[email protected]
Subject
Re: st: factor variables and pweights not accepted in qreg Stata v13
Date
Wed, 26 Jun 2013 11:26:57 -0400
I cannot replicate the problem:
. sysuse auto
(1978 Automobile Data)
. qreg price weight length i.foreign
Iteration 1: WLS sum of weighted deviations = 112795.66
Iteration 1: sum of abs. weighted deviations = 111901
Iteration 2: sum of abs. weighted deviations = 110529.43
Iteration 3: sum of abs. weighted deviations = 109524.57
Iteration 4: sum of abs. weighted deviations = 109468.3
Iteration 5: sum of abs. weighted deviations = 109105.27
note: alternate solutions exist
Iteration 6: sum of abs. weighted deviations = 108931.02
Iteration 7: sum of abs. weighted deviations = 108887.4
Iteration 8: sum of abs. weighted deviations = 108822.59
Median regression Number of obs = 74
Raw sum of deviations 142205 (about 4934)
Min sum of deviations 108822.6 Pseudo R2 = 0.2347
------------------------------------------------------------------------------
price | Coef. Std. Err. t P>|t| [95% Conf. Interval]
-------------+----------------------------------------------------------------
weight | 3.933588 1.328718 2.96 0.004 1.283543 6.583632
length | -41.25191 45.46469 -0.91 0.367 -131.9284 49.42456
|
foreign |
Foreign | 3377.771 885.4198 3.81 0.000 1611.857 5143.685
_cons | 344.6489 5182.394 0.07 0.947 -9991.31 10680.61
------------------------------------------------------------------------------
. qreg price weight length foreign [pw= displacement]
Iteration 1: WLS sum of weighted deviations = 23571568
Iteration 1: sum of abs. weighted deviations = 23596808
Iteration 2: sum of abs. weighted deviations = 23268657
Iteration 3: sum of abs. weighted deviations = 23264763
Iteration 4: sum of abs. weighted deviations = 23242098
Iteration 5: sum of abs. weighted deviations = 23240219
Iteration 6: sum of abs. weighted deviations = 23239934
Median regression Number of obs = 74
Raw sum of deviations 3.54e+07 (about 5379)
Min sum of deviations 2.32e+07 Pseudo R2 = 0.3438
------------------------------------------------------------------------------
| Robust
price | Coef. Std. Err. t P>|t| [95% Conf. Interval]
-------------+----------------------------------------------------------------
weight | 6.274595 .2034548 30.84 0.000 5.868817 6.680372
length | -99.88108 7.523739 -13.28 0.000 -114.8867 -84.87546
foreign | 3937.741 68.35094 57.61 0.000 3801.419 4074.062
_cons | 4400.254 875.7561 5.02 0.000 2653.614 6146.895
------------------------------------------------------------------------------
In the -qreg- help file it says:
"qreg allows fweights, aweights, iweights, and pweights;"
Not sure how this kind of stuff maps to dialog boxes as I never use them.
Joerg
On Tue, Jun 25, 2013 at 5:16 PM, Ariel Linden, DrPH
<[email protected]> wrote:
> I just got version 13 today and immediately fired it up...
>
> Contrary to the help file for -qreg- that says "indepvars may contain factor
> variables; see fvvarlist" and "qreg allows fweights, aweights, iweights, and
> pweights; see weight", I got an error when running the following code:
>
> . sysuse auto
>
> . qreg price weight length i.foreign
> factor variables and time-series operators not allowed
> r(101);
>
> . qreg price weight length foreign [pw= displacement]
> pweight not allowed
> r(101);
>
> n.b. I just noticed that in the dialog box for qreg, there is no pweight
> option...
>
> Ariel
>
> *
> * For searches and help try:
> * http://www.stata.com/help.cgi?search
> * http://www.stata.com/support/faqs/resources/statalist-faq/
> * http://www.ats.ucla.edu/stat/stata/
*
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