We are new here, and have recently gotten a question that we have very much been struggling to answer. It is concerning a question regarding a conjoint analysis in which we have to incorporate an individual-specific intercept. We are working with the a regression model that includes:
- 15 Consumers (subjects)
- 22 Profiles
- 1 - 5 attributes
- amount of Levels varying from 2 levels to 3 levels
We already have all dummies needed to conduct a general conjoint analysis in SPSS. This question however is as follows:
while consumers’ preferences over different attributes and levels are more or less the same, they do have different baseline level of utility (constant terms). As a consequence, to derive more accurate estimation of consumers’ part-worth values, researchers need to make the intercept individual-specific (but the part-worth values are the same across consumers). In your analysis, try to think of a way to incorporate individual-specific intercept in the regression.
We have tried many different approaches but haven't fully figures out how to solve this problem. Can anybody maybe give us some tips? We highly appreciate it!