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st: Re: Nonparametric two way ANOVA


From   "Wagner, Joseph" <WagnerJ@edc.pitt.edu>
To   "'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu>
Subject   st: Re: Nonparametric two way ANOVA
Date   Thu, 5 Feb 2004 19:56:31 -0500

>Joseph doesn't specify whether the really interesting predictor is race >or
age group, or whether race is in any way ordinal (including binary eg >1 for
"Black" and 2 for "White"). However, assuming that race is a boring
>categorical variable and age group is an interesting ordinal variable,
>then Joseph might calculate a Somers' D for the association of viral >load
with age for each race, and then meta-analyse these Somers' D 
>values for each race to create a grand mean Somers' D measuring the
>ability of higher age to predict higher viral load within races.

>More information on the -somersd- and -parmest- packages is available on
>my website (see my signature). Somers' D and Kendall's tau-a are >detailed
in my Stata Journal paper (Newson, 2002), which is available in
>pre-publication draft form on my website. (As is my Stata tip about
>calculating geometric means using the -eform()- option of -regress-.)

>I hope this helps. I would be able to make more specific suggestions if I
>knew more about precisely what association Joseph is trying to measure.

I should've specified - race is, in fact, a categorical variable.  I am
interested in the effect of age on viral load by race.

Could you explain what you mean by "meta-analyse" in terms of using STATA? 
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