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Health care cost data often contain many zero values, for patients who did not use any care. Two‐part models with logistic models for part I, probability of use (ie, nonzero cost) and log‐link models for part II, mean cost of use (ie, nonzero cost) are often used. Effects of exposures or covariates on total (marginal) cost are often of interest, and recent work has proposed useful methods. Factors...
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