[R] Simultaneous Probit-Tobit

[Christopher Shultz]

Hi: 


            

I am trying to write code to run a simultaneous probit-tobit 
model (Chappell, 1982) in order to quantify the determinants of 
legislator voting behavior. I can't seem to find any background on this.
 I have worked with code for simple logit and probit models, but this is
 a different beast. 

The logic is that this model reduces some of the endogeneity 
associated with a single equation model. As a general overview of the 
structure: http://uploadpie.com/yB5mw


Does anyone know if there is a package or simple way to code this? Thanks in advance! 


     		 	   		  
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