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From |
Richard Williams <[email protected]> |

To |
[email protected] |

Subject |
RE: st: RE: Changing beta coefficients - w/ logistic regression |

Date |
Fri, 22 Jul 2005 07:12:17 -0500 |

At 05:53 AM 7/22/2005 -0500, Scott Merryman wrote:

Again, most peculiar, and potentially dangerous if you don't happen to notice that the p option didn't work. If you turn trace on, you see that eventually a statement like this gets executed:Now -predict prob, p- works, in the sense it doesn't return an error, though it does not calculate the probability but rather the fitted values. The probabilities can calculated by using the -invlogit- function, however I am not sure why -predict prob, p - is not calculating the probabilities.

_predict prob2

That statement works correctly before -foo2- is run but not afterwards. For some reason _predict does not know it should default to computing probabilities. There are other values that could be ereturned, so that might be it, but I suspect there is just something "different" about -logit- and -mlogit-.

I'm assuming the whole point of this is to use post-estimation commands like -predict- with the new beta value. Ergo, if you want predicted probabilities, either do like Scott says and use invlogit, or use a routine like -ologit- or -gologit2- that produces equivalent results to logit with a dichotomous dv and which works with the original foo.ado. (I didn't consciously plan it that way, but there are a couple of little things -gologit2- can do that -logit- can't, and working correctly with foo.ado is one of them.)

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Richard Williams, Notre Dame Dept of Sociology

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**References**:**Re: st: RE: Changing beta coefficients - w/ logistic regression***From:*Richard Williams <[email protected]>

**RE: st: RE: Changing beta coefficients - w/ logistic regression***From:*"Scott Merryman" <[email protected]>

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