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From |
Maarten Buis <[email protected]> |

To |
[email protected] |

Subject |
Re: st: Interaction term in logistic regression |

Date |
Tue, 22 Apr 2014 09:20:25 +0200 |

I can see a couple of problems: 1) For a logistic regression the dependent variable needs to be the first variable mentioned in the variable list and it should not contain a prefix (i.). 2) The -xi:- prefix is outdated, you should use the factor variable notation instead whenever possible, see -help fvvarlist-. 3) I would consider using a linear spline (1st order spline) instead of age in categories (0th order spline). The linear spline is a more flexible than age categories, but is still easily interpretable. For even more flexible but still interpretable effects you can look at: Roger B. Newson (2012) "Sensible parameters for univariate and multivariate splines" The Stata Journal, 12(3): 479-504. 4) If you use income as a variable, then I would call it income and not economic status. The latter could be interpreted as more general, for example it could wealth, which you did not do in your model. -- Maarten On Tue, Apr 22, 2014 at 7:12 AM, Ashish Gupta <[email protected]> wrote: > I am planning to employ logistic regression with interactions to see > the effect of socio-economic characteristics on age-specific > mortality.I would like to know that how one can include interaction > term (Age versus economic status) in adjusted as well as unadjusted > model. > Example of the model- > xi : logit i. race i. age_group i. income i.place_res i.age_group ##i.income > > Any response will be appreciated. > * > * For searches and help try: > * http://www.stata.com/help.cgi?search > * http://www.stata.com/support/faqs/resources/statalist-faq/ > * http://www.ats.ucla.edu/stat/stata/ -- --------------------------------- Maarten L. Buis WZB Reichpietschufer 50 10785 Berlin Germany http://www.maartenbuis.nl --------------------------------- * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**Re: st: Interaction term in logistic regression***From:*Ashish Gupta <[email protected]>

**References**:**st: Interaction term in logistic regression***From:*Ashish Gupta <[email protected]>

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