Journal of Official Statistics, Vol.6, No.2, 1990. pp. 165–177
Retrospective Questions and Group Differences
Abstract:Responses about actions undertaken in the past usually contain recall errors. Sikkel (1985) develops models that correct for memory effects that allow greater accuracy in the estimation of parameters that describe a series of actions. Here, these models are extended to estimate group differences in the frequency of certain actions. To do this a family of models is developed that contain (i) parameters for an underlying distribution of actions, (ii) parameters that quantify the memory effects and (iii) one parameter that characterizes the differences between subpopulations for the average frequency of certain events. Examples are taken from a health survey where respondents were asked to recall the number of contacts with the general practitioner and hospitalizations for a given period.
Keywords:Stochastic process; negative binomial distribution; memory effects.
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