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Re: st: how to convert regression coefficients into variables


From   Roger Newson <[email protected]>
To   "[email protected]" <[email protected]>
Subject   Re: st: how to convert regression coefficients into variables
Date   Wed, 30 Mar 2011 11:07:56 +0100

Another possibility is to use the -flist()- option of -parmest- to store a list of -tempfile- names in a global macro. This global macro can then be input to -append- in Stata Version 11 (or to the SSC package -dsconcat- in Stata Versions 10 or below) to produce a concatenated resultsset, containing the contents of the multiple resultssets. For each observation in the concatenated resultsset, the dataset of origin can be identified, if the user specifies an -idstr()- option or an -idnum()- option in the original -parmest- command.

For an example of this method, see the penultimate example in the on-line help for -parmest-, which you can access in Stata by typing

help parmest

I hope this helps.

Best wishes

Roger


Roger B Newson BSc MSc DPhil
Lecturer in Medical Statistics
Respiratory Epidemiology and Public Health Group
National Heart and Lung Institute
Imperial College London
Royal Brompton Campus
Room 33, Emmanuel Kaye Building
1B Manresa Road
London SW3 6LR
UNITED KINGDOM
Tel: +44 (0)20 7352 8121 ext 3381
Fax: +44 (0)20 7351 8322
Email: [email protected]
Web page: http://www.imperial.ac.uk/nhli/r.newson/
Departmental Web page:
http://www1.imperial.ac.uk/medicine/about/divisions/nhli/respiration/popgenetics/reph/

Opinions expressed are those of the author, not of the institution.

On 30/03/2011 09:41, Nick Cox wrote:
Possibly something along these lines

forval i = 1/9 {


On Wed, Mar 30, 2011 at 9:25 AM, Steve Martin<[email protected]>  wrote:
Yes, thanks Dimitriy!

I've one more query.  Following Roger's example, I'm writing the parameters
from successive estimations to tempfiles using: parmest, saving(`"`tf1'"',
replace).

I would like to use this in conjunction with a forvalues i=1/9 command.  How
should I specify `"`tf1'"' if I want to replace the 1 in `"`tf1'"' with i?

Steve


-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Dimitriy V.
Masterov
Sent: 29 March 2011 19:31
To: [email protected]
Subject: Re: st: how to convert regression coefficients into variables

Steve,

Take a look at Roger Newson's package parmest at ssc.

Does that accomplish what you want?

DVM

On Tue, Mar 29, 2011 at 2:26 PM, Steve Martin<[email protected]>
wrote:
I am using -cnsreg- to estimate a constrained regression model in Stata
11.


I am interested in how the coefficient (call this b2) on one particular
regressor changes as I change the constraints (call the values of these b3
and b4) on two of the other regressors.

At the moment the results for each regression are written to a
spreadsheet.

However, it would be useful if I could save the values of b2, b3 and b4
from
each regression (eg by writing to a file) with a view to plotting b2, b3
and
b4 from the 30 or so regressions I estimate.
Is this possible?

Thanks.

Steve





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