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Re: st: single p-value for categorical variables and interactions


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: single p-value for categorical variables and interactions
Date   Wed, 15 Nov 2006 21:14:13 +0000 (GMT)

--- "Richardson, Kelly K." <Kelly.Richardson@va.gov> wrote:
> I have 2 categorical variables: race (1=black 0=white) and
> segregation (1=low 2=medium 3=high). 
> Is it possible to get a single p-value for segregation and a single
> p-value for the interaction between race and segregation in addition
> to a p-value for each of the categories? 

Kelly:
yes, with the -test- command, see example:

*------------ begin example --------------
sysuse auto, clear
recode rep78 1/2=3
xi: reg price i.foreign*i.rep78
test _Irep78_4 = _Irep78_5 = 0
test _IforXrep_1_4 = _IforXrep_1_5 = 0
*------------- end example ---------------

HTH,
Maarten

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

visiting adress:
Buitenveldertselaan 3 (Metropolitan), room Z434

+31 20 5986715

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