[Limdep Nlogit List] Selectivity Tobit with IV

[Martin Linde-Rahr]

Hi, I'm trying to estimate a selectivity Tobit with endogenous variables. The "inst" procedure seems not to work in this setting. What I try to do is 

 

PROBIT        ;  LHS = z ; RHS = V ; Hold $

SELECT        ;  LHS = y1 ; RHS = X1 ; KEEP=YFIT

SELECT         ;  LHS=y2 ; RHS = X2; INST=X2 (but with YFIT instead) ; Tobit ; MLE  $ 

 

The results show no sign of YFIT. Nor do the results change if I skip "inst" Any ideas anyone?

 

 

 

Martin Linde-Rahr

PhD 

Department of Economics

Göteborg University