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A Probit- Log- Skew-Normal Mixture Model For Repeated Measures Data With Excess Zeros, With Application To A Cohort Study Of Paediatric Respiratory Symptoms, Sadia Mahmud, W. Y. Wendy Lou, Neil W. Johnston
A Probit- Log- Skew-Normal Mixture Model For Repeated Measures Data With Excess Zeros, With Application To A Cohort Study Of Paediatric Respiratory Symptoms, Sadia Mahmud, W. Y. Wendy Lou, Neil W. Johnston
Community Health Sciences
Background: A zero-inflated continuous outcome is characterized by occurrence of "excess" zeros that more than a single distribution can explain, with the positive observations forming a skewed distribution. Mixture models are employed for regression analysis of zero-inflated data. Moreover, for repeated measures zero-inflated data the clustering structure should also be modeled for an adequate analysis. Methods: Diary of Asthma and Viral Infections Study (DAVIS) was a one year (2004) cohort study conducted at McMaster University to monitor viral infection and respiratory symptoms in children aged 5-11 years with and without asthma. Respiratory symptoms were recorded daily using either an Internet …