churdle postestimation : how to obtain predicted probability of selection equation

[Marc Duhamel]

Dear community,

I am relatively new to STATA and am struggling at identifying the postestimation command to obtain the predicted probabilities of the selection equation.

I have read the documentation and I am still having a hard time to figure out what exactly to do to compare the results of churdle with those of heckman for the selection equation.

Noting that y is the variable with corner solutions, lny = ln(y) and dy=1 when y>0, here is the basic code I use for the heckman command to obtain the predicted probabilities, heckprob, of the selection equation :

heckman lny $xlist , select(dy = $xlist) 
predict heckprob , psel

I would like to compare the predicted probabilities for the churdle command, churdleprob

churdle exponential y $xlist , select($xlist) 
predict churdleprob /* this is where I am lost */

Your guidance would be mostly appreciated.

Cheers!
Marc