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Dear All, Can some one explain to me what exactly is formula1 and formula2 in the ivprobit(formula1, formula2, data = list(), ...). The manual for ivprobit has quite limited information and i found it difficult to understand. Thank you very much...

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Dear All, I am running the mvProbit model to estimate five equation probit models. In my data all the dependent variables are dichotomous with values 0/1 and lables TRUE/FALSE. The explanatory variables are composed of catagorical and countinous...

That is really helpful - and works perfectly! Thank you very much, all responses have been greatly appreciated. -- View this message in context: http://r.789695.n4.nabble.com/betareg-question-keeping-the-mean-fixed-tp3783303p3855134.html Sent from the R...

Thanks for your response, that does work, however, it is still not quite what want. I would like to tell betareg what the mean is (in my case, 0.5) and force it to use that value. Is this possible...

sorry for the confusion. I used y1,y2,.... instead of the real variable names just for emailing purpose (to forward my question in a more clear way). Tree, nothing...are the real variable names in my data set and i...