A general framework for maximizing likelihood under incomplete data

International audienceMaximum likelihood is a standard approach to computing a probability distribution that best fits a given dataset. However, when datasets are incomplete or contain imprecise data, a major issue is to properly define the likelihood function to be maximized. This paper highlights the fact that there are several possible likelihood functions to be considered, depending on the purpose to be addressed, namely whether the behavior of the imperfect measurement process causing incompleteness should be included or not in the model, and what are the assumptions we can make or the knowledge we have about this measurement process. Various possible approaches, that differ by the choice of the likelihood function and/or the attitude of the analyst in front of imprecise information are comparatively discussed on examples, and some light is shed on the nature of the corresponding solutions