Résumé :
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This paper deals with statistical methods for modelling individual behavior when the endogenous variable is a nonnegative integer. Examples are the number of children, the number of job changes or the number of shopping trips in a given period. Several approachesâPoisson, robust Poisson, negative binomial (NEGBIN), NEGBINk, hurdle Poisson, truncated-at-zero Poissonâare discussed with a focus on specification, estimation, and testing. An application to labor mobility data illustrates the gain obtained by carefully taking into account the specific structure of the data. (Journal of Economic Surveys)
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