it might be of interest that the log provides the following warning after i transformed the linear into a choice design: WARNING: The variable W is in the DESIGN= data set but not the KEY= data set. maybe this helps..... thanks ... View more

it would be a great help if someone could just tell me how i could include holdout tasks, that i designed myself. that is, how i could define the choice sets and insert them manually. by doing so i could bypass the problem, i guess ... View more

Sorry. Respond it so late. But not see what your data look like and what your output look like. Is your contract duration numeric variable? It seems to be a format problem. But I am not sure whether the following is what you need. [pre] proc format; invalue pricefmt 0 = 5 12,24= 0; run; .................. price_two = input(contract_duration_value,pricfmt.); format price_two dollar4.; [/pre] Ksharp ... View more