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st: RE: RE: RE: RE: Accessing to a subvector of vector like


From   Nick Cox <n.j.cox@durham.ac.uk>
To   "'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu>
Subject   st: RE: RE: RE: RE: Accessing to a subvector of vector like
Date   Mon, 6 Feb 2012 19:06:37 +0000

I think you've changed the question. 

Please show us the exact code you used and explain in what sense it is "not working". Otherwise my answer can only be a guess that you did something wrong. 

Nick 
n.j.cox@durham.ac.uk 

Nakelse, Tebila (AfricaRice)

Thank you Nick 
I tried this solution.  But it still not working. 
I want to use expression(pnl_exp) in margins. But if I use this solution stata may not know whether this coefficients are from a estimation and may not  use this information to compute the matrix of covariance for example.

Nakelse, Tebila (AfricaRice)

Thank you Nick. It is okay.

Nick Cox

Just copy to a regular vector first: 

sysuse auto
gen gpm = 1 / mpg
regress gpm  weight length displacement

. mat li e(b)

e(b)[1,4]
          weight        length  displacement         _cons
y1     .00001174     .00006458     5.517e-06     .00152916

. mat b = e(b)

. mat b1 = b[1, "weight".. "length"]

. mat li b1

b1[1,2]
       weight     length
y1  .00001174  .00006458


Nick 
n.j.cox@durham.ac.uk 

Nakelse, Tebila (AfricaRice)

I would like to access to a subvector of a vector like e(b) or e(V). 
Stata allows to have et sub-element as _b[varname]. Is it possible to have _b[varlist] ?


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