Bryan Orme and Rich Johnson report on another methodological test of their Adaptive CBC procedure (comparing it to standard non-adaptive CBC). This time, they study home purchases and employ shorter questionnaires, to see if similar results can be achieved with substantially less information. They use a slightly improved design algorithm as compared to their previous test reported in their 2007 article, "A New Approach to Adaptive CBC". Also, they test the use of a "most likelies" question rather than the standard BYO question.
Adaptive CBC again is shown to have greater internal predictive validity than standard CBC. Reducing the length of the questionnaires doesn't seem to reduce the predictive ability of Adaptive CBC for this test, though the authors caution that some information must have been lost. The "most likelies" option is shown to be a viable approach, though Orme and Johnson caution that the utilities are mis-informed by at least a small degree when using this approach.