We have a study with 30 attributes in a MaxDiff and 30 attributes with 2 to 5 levels in a PPCBC. Now, after the study is done, my client wants to throw out 2 attributes. Mathematically we can throw out attributes, re-scale scores in MaxDiff. But I do not believe it is correct.
Both attributes are highly correlated with several other attributes.
But what happens with the PPCBC? One attribute that the client wants to throw out, price, was shown in every exercise. The other attribute, quality, rotated across 25 PPCBC exercise.
Please provide your expert opinion.