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Re: st: linear and quadratic trend analysis


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: linear and quadratic trend analysis
Date   Tue, 4 Mar 2008 20:59:59 +0000 (GMT)

It is easiest to this in -regress-. Notice that -anova- is just a weird
way of doing -regress- (though some disciplines would say that
-regress- is a weird way of doing an -anova-). Also, I would not limit
the analysis to linear and quadratic terms. I find the restricted cubic
splines created with -mkspline- in Stata 10 quite useful. 

-- Maarten

--- Shelly Mahon <mdmahon@wisc.edu> wrote:

> Hi there,
> I am conducting a study using the National AddHealth data set.  After
> running factorial anovas, it is clear that I need to follow up with a
> trend analysis.  I figured out how to run graphs, but does anyone
> have information on running the statistical tests for trends.  The
> study has four continuous outcome variables, plus sex, age, and grade
> level with one  categorical independent variable.  Any help is much
> appreciated.
> Shelly
> 
> Shelly Mahon
> Ph.D. Candidate
> University of Wisconsin-Madison
> Human Development and Family Studies
> 1430 Linden Drive 
> Madison, WI 53706-1575
> email: mdmahon@wisc.edu
> 
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> 


-----------------------------------------
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/
-----------------------------------------


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