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st: RE: Accessing post-estimation variable names


From   "Nick Cox" <[email protected]>
To   <[email protected]>
Subject   st: RE: Accessing post-estimation variable names
Date   Wed, 8 Dec 2004 18:16:01 -0000

. sysuse auto 

. reg mpg weight price length

. mat b = e(b) 

. local names : colnames b 

. di "`names'"
weight price length _cons

In your code 

mat b = e(b) 
local cn : colnames `b' 

you are using a local macro b, 
which presumably was defined earlier. 
Depending on what it contains, 
some bizarre results would not be 
surprising. 

In fact 

local names : colnames e(b) 

also works. You just need to ignore 
the _cons. 

Nick 
[email protected] 

Jan Teorell
 
> I am writing a program for a post-estimation command where I need 
> to access the names of all the variables (not only the dependent 
> one) that were used by the previous estimation command. For 
> example, after regr y x z w, I want access to the string "y x z w" in 
> my own command (long), parse this string and make a number of 
> transformations on each of its variables. Anyone knows how to 
> access the string? (I thought mat b = e(b), local cn: colnames `b' 
> would to it, but cn contains strange series of numbers, no variables 
> names; apparently, the macro extended function colnames only 
> works in order to name the columns of other matrices with mat 
> colnames.)

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