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Re: st: Non-parametric test equivalents with survey-weighted data

From   Ronan Conroy <[email protected]>
To   "[email protected]" <[email protected]>
Subject   Re: st: Non-parametric test equivalents with survey-weighted data
Date   Fri, 5 Aug 2011 17:24:40 +0100

On 2011 Lún 5, at 17:00, Janet Rosenbaum wrote:

> Frequently I use kwallis, ranksum, or nptrend for testing between
> groups, depending on the nature of the variables involved.  Stata
> doen't support these tests in survey-weighted data.
> Are there any equivalent tests to use when comparing weighted data?
> Survey-weighted data can use Pearson's chi-square or Wald, but my
> understanding is that neither is equivalent.

My feeling is that these excellent old tests lose a lot of information about the effect size. "There is a significant difference" or "a significant trend" always makes me wonder what the difference/trend actually was, and was it significant in real-life terms.

You might want to look at ordered logistic regression, logistic regression etc for ways of producing measures of effect. These are all possible with survey data. 

Ronán Conroy
[email protected]
Associate Professor
Division of Population Health Sciences
Royal College of Surgeons in Ireland
Beaux Lane House
Dublin 2

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