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From |
Barry Ames <barryames@yahoo.com> |

To |
stata <statalist@hsphsun2.harvard.edu> |

Subject |
st: interactive variables with mlogplot in a multinomial logit |

Date |
Wed, 8 Sep 2004 12:19:41 -0700 (PDT) |

Here's my problem: Because I'm running a multinomial logit with lots of categories, I use prchange and mlogplot from Spost. This works fine except when I use interactive independent variables. If I have independent variables A, B, and AxB, then mlogplot would only calculate, I think, the value of a A when B is zero. This is useless, as you can imagine. I have a do file that calculates the coefficients for the two interacted variables for any value of the other variable. In the example that follows, A is Var 1 and B is Var2 and Lula and Serra are two categories of the dependent variable (actually there are many more). First I run the mlogit command, in this case with clustering on a variable called bairro1. then I run the following do file. do c:\temp\neigh; neigh A B AxB Lula Serra; capture program drop neigh program define neigh quietly summ `1' local mean1=r(mean) local sd1=r(Var)^.5 sort bairro1$which egen tempneigh=mean(`2'), by (bairro1$which) by bairro1$which: gen tempnumber=_n quietly summ tempneigh if tempnumber==1 drop tempneigh tempnumber local mean2=r(mean) local sd2=r(Var)^.5 local var1="`1'" local var2="`2'" local var3="`3'" while "`4'"~=""{ display display display "The following is the slope of `var1' for `4'/base when `var2' is 1 standard deviations BELOW its mean lincom (`mean2'-1*`sd2')*[`4']`var3'+[`4']`var1' display display mac shift } end ******************************************************* So here the program is calculating, for the first variable in the interaction, the coefficient and standard errors for five different values of the other interacted variable. What I need to do is to link this to mlogplot so that I can show the impact of the variable at various values of the other variable. any ideas? * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

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