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Thanks Michiel - that is fantastic. I'd managed to get it to run with the previous syntax by also dropping the interaction, but will run it using your conditions and rejection syntax. I take your point on the small priors and the effect on sample size, but based on a number of other posts etc, I was ...

Thanks for those replies Michiel, particularly the clarification on the interaction. To expand a little; mode is indeed categorical (not linear), frequency could be treated as either categorical or linear (depending on the scale - it is based on how often something is used).

With respect to the ...

Hi All
Hoping you can help me out here. I've been playing with the design below for a pilot (hence the odd priors - based on published literature). It will happily produce a design if I run it with the contraint operating in only one of the alternatives (say A), but I need it to apply to both A and ...