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From |
vwiggins@stata.com (Vince Wiggins, StataCorp) |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: marginsplot error, with continuous variable and factor variables |

Date |
Fri, 24 Aug 2012 12:29:53 -0500 |

Carla Valle-Painter <Carla.Valle-Painter@cic.gc.ca> writes that -marginsplot- is exiting with the admittedly-unhelpful error, _marg_save has a problem. Margins not uniquely identified. r(9999); The error message is not helpful because it is triggered by an impossibility trap in -marginsplot-. This is essentially a message intended for the developers of Stata that we have a bug. All -marginsplot- knows is that the results it has fetched from -margins- do not seem to uniquely identify the margins and because of this -marginsplot- cannot go on. This is either a bug in -margins- or in the utility that fetches results from -margins-. We have tried variations of the sequence that Carla describes but cannot reproduce the problem. I have contacted Carla off list to get more information and will report back to the list when we know more. Best wishes, -- Vince vwiggins@stata.com ------------ Original message --------------------------- From: "Valle-Painter.Carla" <Carla.Valle-Painter@cic.gc.ca> Subject: st: marginsplot error, with continuous variable and factor variables Hi, I am getting an error from marginsplot and I cannot understand what it means: I am using Stata/IC 12.0 I estimated a logit model, with many independent variables which are factor variables, and a few continuous variables. I wish to do a marginsplot of a dummy variable (Qc) across the values of one of the continuous variables. I wanted to do this setting the factor variables at particular levels, rather than setting them "atmeans" or "asobserved" So I ran the following command (note etc. etc. means there are other variables set at particular values that I am not listing here): . margins Qc, at(pgrcount = (0 (1) 18) sex=2 lis5tiles7=3 agecats=3 etc. etc.) where pgrcount is my continuous var (really it is a count), ranging from 0 to 18. I do get the margins for this, and then try to run the marginsplot as follows: . marginsplot, xdimension(pgrcount) xlabel(0 (1) 18) But I get this error message: Variables that uniquely identify margins: pgrcount Qc uslist :_at15 _m1: _marg_save has a problem. Margins not uniquely identified. r(9999); Thanks in advance to anyone who can throw some light on this. Carla * * 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/

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