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From |
Donald Spady <dspady@ualberta.ca> |

To |
Statalist Statalist <statalist@hsphsun2.harvard.edu> |

Subject |
st: Including components of a summative score in regression |

Date |
Mon, 30 Jul 2012 13:46:17 -0600 |

Dear Statalisters I am doing some logistic regression analysis, some of the variables of which are made up of the values of other variables; e.g. N = A + B + C/D. Is it reasonable, or appropriate, to include A, B, C, or D in the equation if N is already in it. i.e. logistic X F G H N A B C D, where F G H are some variables, and N is made up of A B C D, but for some reason or other A B C D are desired to be in the equation. My impression is that statistical theory would say this is a no-no, largely because of collinearity; however, if I do it, sometimes I get a better 'fit' to the equation (using estat gof, group(10)). Thanks Donald Spady -- dspady@ualberta.ca * * 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: Including components of a summative score in regression***From:*Richard Williams <richardwilliams.ndu@gmail.com>

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