Hi dear sir! As you said before I attached a sample of my data with this message and the codes which I have used to run the conditional logit are as following: proc MDC data=work.leafy;*/basic model/*; title 'Basic Model'; model answer= none appearance_wholesome ps_organic tm_super mygap_cert price /type= clogit nchoice=3; id questions; output out=probdata pred=p; run;   After I estimated the coefficients for each variable I calculated Willingness to pay using this formula WTP=B(variable)/-Bprice Now I want to know how I can calculate the standard error for WTP using bootstrapping method. ... View more

Hi dear sir!  Firstly, I estimated the a conditional logit model using proc MDC in SAS then I computed the willingness to pay using this formula WTP=B(attributes)/-Bprice. Now I want to know how I can calculate the standard error or confidence level for estimated willingness to pay using bootstrapping method in SAS. ... View more

I have tried this with Proc MDC but it didn't work and it needs class statement. ... View more

Really I want to know how can I use the interactions terms (socio-demographic factors with attributes of the alternativesl) conditional logit using SAS. Could you please help me. ... View more

thanks for your help but I need to identify the effects of socio-demographic factors on choices and I do not know how to do that with SAS. could you please help me ... View more