Statalist


[Date Prev][Date Next][Thread Prev][Thread Next][Date index][Thread index]

AW: st: table of deviance after multiple regression!


From   "Heckendorn Felix" <felix.heckendorn@fibl.org>
To   <statalist@hsphsun2.harvard.edu>
Subject   AW: st: table of deviance after multiple regression!
Date   Tue, 1 Jul 2008 16:52:41 +0200

The problem in fact might appear simple. I have an experiment with 3 different treatments (one of which is the control treatment). The response variable follows a negative binomial distribution.
The experiment was conducted at 6 different sites which gives us 6 replicates (n=6).
What I ultimately want to know is:
1. how much better is my treatment 1 and 2 when compared to the control.
2. is there a significant influence of the experimental sites.

I recoded my treatments and have set the control treatment to 0. My model then consists of my response and two explanatories (i) treatment and (ii) experimental site. With the gnbreg command I get coefficients for the 2 treatments and for 5 experimental sites (one site omitted). If I want to know whether experimental site as such is an important variable for the model, I need to check the model with and without the variable 'experimental sit'. Apparently the residual deviance D allows an answer to that question. How to do?  
Cheers, felix
____________________________________________
 
Felix Heckendorn, Dr. Sci. ETHZ
Forschungsinstitut für Biologischen Landbau (FiBL)
FG Veterinärparasitologie
Ackerstrasse
CH - 5070 Frick
www.fibl.org
 

-----Ursprüngliche Nachricht-----
Von: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Maarten buis
Gesendet: Dienstag, 1. Juli 2008 15:53
An: statalist@hsphsun2.harvard.edu
Betreff: Re: st: table of deviance after multiple regression!

--- Heckendorn Felix <felix.heckendorn@fibl.org> wrote:
> After a negative binomial regression with 2 explanatory variables I
> want STATA to show the corresponding table of deviance. I really
> can't find the correct command. Can anybody help?

What do you mean with a table of deviance? The same concept often has
different names in different disciplines, and this term just sounds
like one of those concepts that has been reinvented and renamed many
many times. If you can describe what is supposed to be in this table
than people from other disciplines can also help you.

-- Maarten

-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology
Vrije Universiteit Amsterdam
Boelelaan 1081
1081 HV Amsterdam
The Netherlands

visiting address:
Buitenveldertselaan 3 (Metropolitan), room Z434

+31 20 5986715

http://home.fsw.vu.nl/m.buis/
-----------------------------------------


      __________________________________________________________
Not happy with your email address?.
Get the one you really want - millions of new email addresses available now at Yahoo! http://uk.docs.yahoo.com/ymail/new.html
*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/

*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   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   |   What's new   |   Site index