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From |
Maarten Buis <maartenlbuis@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: How to get marginal effect of quadratic term in tobit model in stata 11.0 |

Date |
Mon, 18 Jul 2011 13:18:05 +0200 |

On Mon, Jul 18, 2011 at 1:07 PM, lutunnahar begum wrote: > I am using stata 11.0. I am interested in non-linear effect of some of > the regressors in tobit model....but for tobit, we don't get any > marginal effect for quadratic term. And that is exactly as it should be. Conceptually, adding a squared term of a variable x only means that x has a non-linear effect. So there is only one variable x. The fact that the the variable x is entered in the model as two "variables", x and x^2, does not change the fact that from a substantive point of view there is only one variable. Maybe you find the following helpful: <http://www.maartenbuis.nl/publications/inter_quadr.html> Hope this helps, Maarten -------------------------- Maarten L. Buis Institut fuer Soziologie Universitaet Tuebingen Wilhelmstrasse 36 72074 Tuebingen Germany http://www.maartenbuis.nl -------------------------- * * 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: How to get marginal effect of quadratic term in tobit model in stata 11.0***From:*lutunnahar begum <pikitardif@gmail.com>

**References**:**st: How to get marginal effect of quadratic term in tobit model in stata 11.0***From:*lutunnahar begum <pikitardif@gmail.com>

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