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Re: st: RE: change values of e(b)


From   Hung-Jen Wang <hjwang@econ.sinica.edu.tw>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: change values of e(b)
Date   Wed, 4 Dec 2002 17:16:28 +0800

Wednesday, December 4, 2002, 4:50:04 PM, Nick Cox wrote:

> Revising history is best left
> to science fiction writers and, indeed, 
> historians. 

Well put, Nick. But if I may, I want to emphasize that the reason I
wish to change values of e(b) is only for the purpose of exploring the
data and properties of an estimator which is a function of the
predicted values. Please spare me with the details. (I know what I am
doing.)

So, from a pure technical point of view, is it possible to change
values of e(b)?

HJW


>> Is there any way to change elements of the coefficient vector e(b)
>> obtained after an estimation? For example, suppose I want to
>> replace the 5th element of the coefficient vector by a value of
>> 2.2; the following does not work:
>> 
>>  . mat e(b)[1,5] = 2.2
>>  matrix operation not found
>>  r(501);
>> 
>> I know the following works:
>> 
>>  . mat b0 = e(b)
>>  . mat b0[1,5] = 2.2
>> 
>> but I want to work with e(b) since I'll later use -predict- to do
>> some experiments, and I assume that -predict- recognizes e(b)
>> only.

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