Bookmark and Share

Notice: On March 31, it was announced that Statalist is moving from an email list to a forum. The old list will shut down on April 23, and its replacement, statalist.org is already up and running.


[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: st: Including components of a summative score in regression


From   Donald Spady <dspady@ualberta.ca>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Including components of a summative score in regression
Date   Tue, 31 Jul 2012 09:40:12 -0600

Maarten
  Thanks for the reference.  I'll try and get it at my University library.  
Don 
On 2012-07-31, at 1:35 AM, Maarten Buis <maartenlbuis@gmail.com> wrote:

> At 02:46 PM 7/30/2012, Donald Spady wrote:
>>> I am doing some logistic regression analysis, some of the variables of
>>> which are made up of the values of other variables; e.g. N = A + B + C/D.
>>> Is it reasonable, or appropriate, to include A,  B, C, or D in the
>>> equation if N is already in it.
> 
> On Mon, Jul 30, 2012 at 11:12 PM, Richard Williams wrote:
>> I believe the improvements in fit stem from
>> 
>> * N constrains the coefficients of A and B and C/D to be equal; adding A and
>> B relaxes two of those constraints.
> 
> Also see:
> M.L. Buis (2012) "Stata tip 108: On adding and constraining", The
> Stata Journal, 12(2), pp. 342-344.
> 
> Hope this helps,
> Maarten
> 
> --------------------------
> Maarten L. Buis
> Institut fuer Soziologie
> Universitaet Tuebingen
> Wilhelmstrasse 36
> 72074 Tuebingen
> Germany
> 
> 
> http://www.maartenbuis.nl
> --------------------------
> *
> *   For searches and help try:
> *   http://www.stata.com/help.cgi?search
> *   http://www.stata.com/support/statalist/faq
> *   http://www.ats.ucla.edu/stat/stata/
> 

Donald Spady

--
dspady@ualberta.ca





*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/


© Copyright 1996–2014 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   Site index