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Abstract
urnal of Data Science 13(2015), 1-20 Assessing Effects of An Intervention on Bottle-Weaning and Reducing Daily Milk Intake from Bottles in Toddlers Using Two-Part Random Effects Models
Highlights
In many applications, the response variable has a point mass at 0 and a continuous rightskewed distribution for nonzero values
A zero-inflated Tobit model proposed by Moulton and Halsey (1995) may not be suitable for analyzing the total daily milk intake from bottles data because it will require the assumption that some of weaned toddlers will return to bottle use during the study period and an observation that has no daily milk intake from bottles is either a true zero from a toddler off bottles or a censored zero from a toddler who drinks from a bottle but happens to not drink from a bottle in the current period
We propose the use of a two-part random effects model to model the response variable, total daily milk intake from bottles, that can take a value either from a point mass at 0 or from a right-skewed, continuous distribution and to assess effects of the bottle-weaning intervention on reducing the probability of bottle use and the intensity of total daily milk intake from bottles over 12 months of follow up in toddlers aged 11 to 13 months
Summary
The response variable has a point mass at 0 and a continuous rightskewed distribution for nonzero values. A zero-inflated Tobit model proposed by Moulton and Halsey (1995) may not be suitable for analyzing the total daily milk intake from bottles data because it will require the assumption that some of weaned toddlers will return to bottle use during the study period and an. We propose the use of a two-part random effects model to model the response variable, total daily milk intake from bottles, that can take a value either from a point mass at 0 or from a right-skewed, continuous distribution and to assess effects of the bottle-weaning intervention on reducing the probability of bottle use and the intensity of total daily milk intake from bottles over 12 months of follow up in toddlers aged 11 to 13 months.
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