st: Bivariate probit with sample selection

[Bo Wandschneider <bo@uoguelph.ca>]

We are new to Stata and are still learning our way around this package - 
different philosophy than things like SAS, TSP, Shazam or Limdep.  We 
have a user who wants to duplicate some results they had in Limdep.

In limdep we simply ran the individual probits, stored the betas and 
used these as starting values in the bivariate probit.  After this 
equation we entered the Select command for sample selection.   We can 
get to the bivariate probit (without the starting values), but are 
unsure how to program the next step.   We have checked manuals, but 
don't have the 'SVY' manual (we are ordering it)  
Any suggestions were to look ... just need a starting point -

here is an excerpt from limdep

 Probit ;Lhs = public
      ;Rhs = one, age, agesq, reg1, reg3, reg4, reg5, urban,
ottawa, mover, sch2, sch3, sch4, sch5, edart, human,
social, bus, hsc, sceng, mteng, mtfr, mtef, ysm, ysmsq, vismin ;
Hold results $
list; B$
matrix; B1=B$
Probit ; Lhs = engfr
;Rhs = one, age, agesq, reg1, reg3, reg4, reg5, urban,
sch2, sch3, sch4, sch5, edart, human, social, bus, hsc, sceng,
mteng, mtfr, mtef, marit, que, west, us, eur, asia, ysm, ysmsq ;
Hold results $
list; B $
Matrix; B2=B $

Bivariate Probit; LHS = Public, engfr;
RH1 =  one, age, agesq, reg1, reg3, reg4, reg5, urban, ottawa,
mover, sch2, sch3, sch4, sch5, edart, human,
social, bus, hsc, sceng, mteng, mtfr, mtef, ysm, ysmsq, vismin ;
RH2 =  one, age, agesq, reg1, reg3, reg4, reg5, urban, sch2,
sch3, sch4, sch5, edart, human, social, bus, hsc, sceng,
mteng, mtfr, mtef, marit, que, west, us, eur, asia, ysm, ysmsq ;
start = B1, B2; Hold $

SELECT ;Lhs = LNW
     ;Rhs = one, exp, expsq, reg1, reg3, reg4, reg5, urban,
marri, common, divor, vismin, sch2, sch3, sch4, sch5,
edart, social, human, bus, sceng, hsc, manag, super,
science, health, socsc, trade $

SELECT ;Lhs = LNW
     ;Rhs = one, exp, expsq, reg1, reg3, reg4, reg5, urban,
marri,
common, divor, vismin, sch2, sch3, sch4, sch5,
edart, social, human, bus, sceng, hsc, manag, super,
science, health, socsc,
trade; selection=1,0 $

SELECT ;Lhs = LNW
     ;Rhs = one, exp, expsq, reg1, reg3, reg4, reg5, urban,
marri,
common, divor, vismin, sch2, sch3, sch4, sch5,
edart, social, human, bus, sceng, hsc, manag, super, science,
health, socsc,
trade, in1, in2, in3, in4, in5, in6, in8, in9, in10; selection=0,1 $
..... and so on

--
+------------------------------+
Bo Wandschneider              
Manager, Academic Services
Computing and Communications Services 
University of Guelph
Guelph, Ontario, Canada
N1G 2W1		519-824-4120 x 56410  
+------------------------------+


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