I am preparing a discrete choice experiment. I did a linear design with kuhfeld's sas makros, %mktex to be precise.
I now need to add holdout tasks, which turned out to be rather difficult, as i placed restrictions on my design. Everytime I add holdouts using the holdout= option of the %mktex makro, the result is that the restrictions in my choice tasks are gone.
This is followed by turning it into a choice design via %mktroll etc etc.
I can not run the restriction makro in the second %mktex-line, as sas tells me problems occur if i include both an init= and and restriction= statement.
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