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Re: st: documentation on iteration for a non linear regression


From   Nick Cox <njcoxstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: documentation on iteration for a non linear regression
Date   Tue, 12 Jun 2012 22:45:34 +0100

Do look inside e(b).

Nick.

On Tue, Jun 12, 2012 at 10:40 PM, tashi lama <ltashi32@hotmail.com> wrote:
> ereturn list will will provide e(b) under matrices like
>
> ereturn list
>
> scalars:
>
> macros:
>
> matrice:
>
>      e(b): 1*2
>
>
>
> that doesn't tell much, does it. Looks like a size of a matrix. I was looking for the the values of parameters b0 and b1 in the table saved as macro or scalar.
>
>
>
>  Source |       SS       df       MS
> -------------+------------------------------         Number of obs =       312
>       Model |  49079.3588     2 24539.6794         R-squared     =    0.9785
>    Residual |  1077.64118   310  3.47626187         Adj R-squared =    0.9784
> -------------+------------------------------         Root MSE      =  1.864474
>       Total |       50157   312  160.759615         Res. dev.     =   1272.15
>
> ------------------------------------------------------------------------------
>        hits |      Coef.   Std. Err.      t    P>|t|     [95% Conf. Interval]
> -------------+----------------------------------------------------------------
>         /b0 |   632.7244   16.97061    37.28   0.000     599.3323    666.1166
>         /b1 |   .3304635   .0074969    44.08   0.000     .3157122    .3452148
> ------------------------------------------------------------------------------

>> Subject: Re: st: documentation on iteration for a non linear regression
>> From: njcoxstata@gmail.com
>> To: statalist@hsphsun2.harvard.edu
>>
>> On Tue, Jun 12, 2012 at 10:09 PM, tashi lama <ltashi32@hotmail.com> wrote:
>>
>> Is there a documentation in Stata which tells how iteration for a non
>> linear regression is done? I am having trouble with initializing the
>> parameters. I am hoping I will have a better idea to initialize the
>> parameters if I understand the iteration process.
>>
>> >>> See the help and the manual entry as usual. The iteration is faster if you have even a rough idea of what the correct values should be.
>>
>> Also, when I run a non linear regression model, the values of the
>> estimated parameters aren't returned. Isn't it a choke?
>>
>> >>> I don't know what "choke" means here, but this is utterly incorrect. Look in e(b).
>> *

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