Stata The Stata listserver
[Date Prev][Date Next][Thread Prev][Thread Next][Date index][Thread index]

st: Re: bivariate probit problem with no (0,0) observations

From   Friedrich Huebler <>
Subject   st: Re: bivariate probit problem with no (0,0) observations
Date   Mon, 26 Sep 2005 08:24:09 -0700 (PDT)


You have three possible outcomes: (1,1), (1,0) and (0,1). This means
that you can fit a multinomial logit model.

Friedrich Huebler

--- Pierre Lafaye de Micheaux <> wrote:
> Dear Stata gurus,
> Here is the experiment we are conducting:
> Laboratory rats are smelling some kind of odour and then we measure
> their neuronal activity. We then observe the presence/absence of
> gamma or beta waves.
> But you should always have some kind of wave (beta or gamma). The 
> absence of the two waves means a failure in the experiment.
> So you only have (1,1), (1,0) and (0,1) data.
> And never (0,0) data. (But when the rat is dead, or the electrod
> badly placed, etc ...).
> We are interested in modeling the presence/absence of gamma or beta
> waves as a function of odour's characteristics.
> We then wanted to use a bivariate probit analysis (through biprobit
> for example) but the fact that there is no (0,0) observations
> (structural zero case) seems to be a problem.
> Do you know how we could handle this?
> Best regards,
> Pierre

Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around 
*   For searches and help try:

© Copyright 1996–2017 StataCorp LLC   |   Terms of use   |   Privacy   |   Contact us   |   What's new   |   Site index