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

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: observations differ with lrtest because of interaction terms |

Date |
Tue, 18 May 2010 17:38:47 -0500 |

At 04:13 PM 5/18/2010, Meredith Carlson wrote:

Hello Stata users,I'm a Stata rookie, so please bear with me... I'm having problemswhen I run lrtest with logistic regression to test for interactionbetween wealth index and region variables. The number ofobservations differ, not because of missing values, but because ofthe interaction terms. The model including interaction has fewerobservations because some have been dropped because of this note...note: _IsesXreg_3_9 != 0 predicts failure perfectly _IsesXreg_3_9 dropped and 4 obs not usedWhat exactly does this note mean? What can I do to correct thenumber of observations so lrtest will run?

------------------------------------------- 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: observations differ with lrtest because of interaction terms***From:*Meredith Carlson <grlfrendinac0ma@yahoo.com>

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