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st: Generating fracplots with fractional polynomials in a multilevel model (xtmelogit command)


From   "SteffenSchuele@t-online.de" <SteffenSchuele@t-online.de>
To   statalist@hsphsun2.harvard.edu
Subject   st: Generating fracplots with fractional polynomials in a multilevel model (xtmelogit command)
Date   Thu, 08 Sep 2011 11:22:43 +0200

Hello everybody,
to consider non-linear relationships I would like to include fractional polynomials in a multilevel logistic model. I did a multi fractional polynomial analysis (mfp command) with all variables of the whole model in advance to detect non-linearity. Within the mfp command there is the possibility to generate fracplots of the transformed variables (command fracplot), visualizing the non-linear curve in a plot. After that I imported the whole model with the generated polynomials and the variables which remained linear in a multilevel logistic analysis (command xtmelogit) to consider random effects. The problem is that I have a non-linear relationship of one variable, which is represented with two transformed fractional polynomial variables in my model. How can I visualize now the non-linear relationship in a plot? Is there a possibility to generate fracplots after the xtmelogit command in order ro visualize the non-linear curve?

Thanks a lot in advance for your help!

Greetings!

Steffen Schüle (Tropical Institute Munich)   
 
 



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