program define sptobitmstardh1
version 11.0
args lf XB ZB Rho1 Sigma
tempvar Ro1 rYW1 D0 D1 A
qui gen `D0'=0
qui gen `D1'=0
qui replace `D0' =1 if $ML_y1 ==spat_llt
qui replace `D1' =1 if $ML_y1 > spat_llt
qui gen double `Ro1' =`Rho1'*mstar_W1
qui gen double `rYW1'=`Rho1'*w1y_$ML_y1
qui replace `lf' = log(1-`Ro1')+`D0'*log(normal(-(`rYW1'+`XB')/((`Sigma'*exp(`ZB'))))) ///
 -0.5*log(2*_pi)-0.5*log(((`Sigma'*exp(`ZB')))^2) ///
 -0.5*`D1'*($ML_y1-`rYW1'-`XB')^2/((`Sigma'*exp(`ZB')))^2
end