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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 ...

Sorry. The code was truncated in the original post. Below is the code in its entirety:

Design
;alts (neverdisclosed) = alt1*, alt2*, alt3
;alts (disclosed) = alt1*, alt2*, alt3
;rows=12
;eff = f1(mnl,d)
;fisher(f1) = des1(neverdisclosed[0.5]) +des2(disclosed[0.5])
;con

?---CONSTRAINTS---?
;cond ...

Hello. I am trying to specify global constraints for multiple models in a single design. The multiple models correspond to different covariate levels. However, I am given this error message when I try to generate the design:

"Error in Command 1: An attribute, 'alt.1.admin', specified in the ';cond ...