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From |
Rahsaan Maxwell <rahsaan@polsci.umass.edu> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
st: Multilevel model (xtmixed) question |

Date |
Tue, 08 Dec 2009 14:18:24 -0500 |

Hello- I am writing an article that involves several models estimated with xtmixed. My problem is that some of the independent variables have non-linear relationships with the DV. Normally, I understood that to address this problem one should include the IV plus the IV squared. However, my variables are all standardized to mean zero so when I square them that obviously turns them into garbage. In addition, some of these variables with non-linear relationships are latent variables derived from factor analysis so I can't just re-code them into all positive values. I could create a new index variable from the particular variables that comprise the loadings but that loses all of the value of deriving latent variables in terms of error correlations. In addition, the paper has 9 DVs and most of these IVs are relevant across several DVs but are only non-linear with a few of them. Therefore I'm thinking it might get too confusing presentation-wise to include the basic index version of the IV in some models and the latent variable factor analysis version of the IV in other models? The 'simple' solution would be including the basic version of the variables without any of the squared terms and then mentioning that I ran alternative specifications. But those models would probably be terribly mis-specified? Any advice would be much appreciated, -Rahsaan Rahsaan Maxwell Assistant Professor Department of Political Science University of Massachusetts, Amherst http://polsci.umass.edu/profiles/maxwell_rahsaan ----- End forwarded message ----- Rahsaan Maxwell Assistant Professor Department of Political Science University of Massachusetts, Amherst http://polsci.umass.edu/profiles/maxwell_rahsaan * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**Re: st: Multilevel model (xtmixed) question***From:*Maarten buis <maartenbuis@yahoo.co.uk>

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