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From |
Richard Williams <richardwilliams.ndu@gmail.com> |

To |
statalist@hsphsun2.harvard.edu, statalist@hsphsun2.harvard.edu |

Subject |
Re: st: st: Interpreting mfx & margeff Coefficients from GLM |

Date |
Tue, 03 Apr 2012 09:29:59 -0500 |

At 04:01 PM 4/2/2012, Clifton Chow wrote:

Stata listers,I ran a glm log link (family gamma from modified park's test) on mydataset in which the dependent variables is hours worked. Tointerpret the coefficients in the model, I transformed it via mfxand margeff. I have a couple of questions about interpreting thecoefficients after transformation;1. Is mfx mainly appropriate for indicator explanatory variables andmargeff for continous ones?2. Can I interpret the results of the mfx coefficients in the rawscale (i.e. hours)?3. What does the column in the far right X referred to in the mfx output?

Below is my partial mfx output from GLM: y = Predicted mean hours (predict) = 8.7005381 ------------------------------------------------------------------------------------------------variable | dy/dx Std. Err. z P>|z| [ 95%C.I. ] X---------+--------------------------------------------------------------------------------------X1*| 8.891796 1.83527 4.84 0.000 5.2947412.4889 .237385X2*| -5.151794 1.41499 -3.64 0.000 -7.92513-2.37846 .519545(*) dy/dx is for discrete change of dummy variable from 0 to 14. For margeff, to interpret these in hours, should I exp(margeffcoefficient)?Average partial effects after glm y = log(hours) ------------------------------------------------------------------------------variable | Coef. Std. Err. z P>|z| [95%Conf. Interval]-------------+----------------------------------------------------------------X1 | 16.5519 3.9611 4.18 0.000 8.78828724.31551X2 | -7.379914 1.553438 -4.75 0.000 -10.4246 -4.335232 Thanks * * 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/

------------------------------------------- Richard Williams, Notre Dame Dept of Sociology OFFICE: (574)631-6668, (574)631-6463 HOME: (574)289-5227 EMAIL: Richard.A.Williams.5@ND.Edu WWW: http://www.nd.edu/~rwilliam * * 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/

**References**:**st: st: Interpreting mfx & margeff Coefficients from GLM***From:*"Clifton Chow" <clifton_chow@post.harvard.edu>

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