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

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: problem with factor variables in RE probit |

Date |
Tue, 27 Sep 2011 10:29:32 -0400 |

At 07:41 AM 9/27/2011, Liberini, Federica wrote:

Dear listers, I am having problems using the factor variables in a RE probit model. My "group" variable is a categorical that can take up to 3 different values. My "X" variable is a continuous. What I did was to compare two regressions: tab group, gen(group) gen gr1_x=group1*x gen gr2_x=group2*x xtprobit y x group1 group2 gr1_x gr2_x xbar zbar, re compared to xtprobit y b3.group##c.x xbar zbar, re (the xbar and zbar variables are for the RE specification) Now, before running the two regressions I made sure that the virtual variables generated by b3.group##c.x were identical to the varlist x group1 group2 gr1_x gr2_x . I did this by typing list x group1 group2 gr1_x gr2_x b3.group##c.x in 1/100 and they were! So why is that the two regression command return different outcomes?

xtprobit y x b3.group b3.group#c.x xbar zbar, re

------------------------------------------- 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: problem with factor variables in RE probit***From:*"Liberini, Federica" <F.Liberini@warwick.ac.uk>

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