We're looking at using conjoint to back into a chart audit study. Have physicians pull 5 to 10 of their patient charts and fill in the information on the patient and which drug they prescribed. Looking back at Keith's Choice Experiments for Physicians 2015 paper, I see this approach matches to Figure 7: Patient Type Experiment. Which maybe then isn't an out of the box conjoint at all based on his description. Am trying to figure out how viable this approach to a chart audit study is? Using his example of 5 patient attributes each with 3 levels - and then let's say 4 drug options, what might a minimum sample size look like to even get rudimentary utilities? Of course, we also have to consider the number of charts we can reasonably ask them to pull. Maybe 5 to 10 would be the top which represents the number of exercises so that would also limit the amount of data we have. I imagine this would have to be a custom analysis? Sound like a viable approach? Even if we only have n=200? Thanks!