Dear Ngene moderators,
Just as many others, I have been finding this forum so helpful. Thank you for putting the effort in explaining all questions in depth!
I have a simple situation: I would like to have a design where scenarios are assigned to respondents, but do not vary for a given respondent. I am aware of the 'cost' conceptually, that the responses to these scenarios will be correlated to the respondents' differences, but I believe that our sample size will even those out. The benefit, in this case, is avoiding the confusion about the context...
So, how do I do that? As far as I see, Section 8.5 of the manual covers the case of scenarios changing within each survey. I did not find the instruction of my case elsewhere in the manual or here (please, let me know, if I missed it!).
So far my best idea: create a design without scenario attributes, block the design, and assign each block a different scenario.
However, the scenario enters the utility both as a main and as an interaction effect. I wonder if I may run into trouble estimating the interactions if I do not optimise the design with it?
I am creating an efficient design otherwise.
How do you recommend to do this (conceptually and technically)?
Thanks already,
Baiba