Hello,
Apologies for this very basic question, but I was wondering if someone could confirm whether or not interactions between design attributes and covariates impact the degrees of freedom calculation, and hence the number of choice tasks needed in the study design.
At the moment, I assume that only interactions between design attributes impact the minimum required number of degrees of freedom, and that interactions between design attributes and sociodemographic covariates are inconsequential to the degrees of freedom calculation.
Many thanks,
Stephen