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From |
Matthijs De Zwaan <m.dezwaan@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
st: graphing results |

Date |
Wed, 9 Sep 2009 12:34:10 +0200 |

Dear Stata-listers, I am trying to graph the results of my regression. I have estimated a model with quadratic terms and an interaction, as in y=x1 + x1^2 + x2 + x1*x2. I am trying to plot my results in a graph of y versus x1. Using -adjust- to keep covariates doesn't do what I need, since it also sets x1*x2 to the mean of the interaction, rather than x1*(mean x2). I can get what I want by plotting it using the -graph twoway function- command. My current code looks like: graph twoway scatter y x1 /// || function y = _b[_cons] + _b[x1]*x = _b[x1^2]*x^2 + _b[x2]*x2_bar + _b[x1*x2]*x1*x2_bar , where x2_bar is the mean of x2 (in the estimation sample). However, when imported in a document, the final graph looks coarse: more like a like a step-function than a smooth line, even when using 2500 points to graph the function instead of the default 300. Is there a way to get a graph that produces the effect of x1 on y controlling for covariates, but that looks better than what I have now? Thanks for helping! Matthijs * * 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**:**st: RE: graphing results***From:*"Isabelle Deltour" <deltour@cancer.dk>

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