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AN INFLUENCE APPROACH FOR SENSITIVITY ANALYSIS OF NON-RANDOM DROPOUT BASED ON THE COVARIANCE STRUCTURE

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A generalized Heckman model is used for the joint modeling of longitudinal continuous responses and dropout in order to see the influence of a small perturbation of the elements of the covariance structure on displacement of the likelihood. The perturbation from random dropout in the direction of informative dropout is considered for Mastitis data

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