[R] Help

This is my first time to use R.  For clarification: I made an oa design for 4 factors with the following levels: one with 4 levels, 2 with 3 levels, 1  with 6 levels.  Using DoE package, I have generated 72 runs (setting the columns="min3"). However, the numbers of generalized words of lengths

[R] How to treat dominant alternatives & infeasible/unrealistic alternatives in the choice set

Please help! I made an oa design using the DoE package of R.Then, I created the 18 blocks containing 4 choice sets and converted these into questionnaire form using rotation method of the CE support package.However,some of the alternatives in the choice sets are infeasible/unrealistic and domin