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A4 - PUBH 7430 Assignment 4 J Wolfson Due at the beginning...

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PUBH 7430 Assignment 4 J. Wolfson November 10, 2011 Due: November 22, 2011 at the beginning of class On this (as all homeworks) unedited computer output is NOT acceptable. Tables and plots prepared from statistical output should be appropriate for inclusion in a scientific report, with all statistics rounded to a reasonable number of significant digits. Background For this assignment, we will be revisiting the beta-carotene supplementation data you explored in Assignment 0. The data are available in comma-separated format on the class webpage, where you will also find a description of the dataset. Treat time as a continuous variable unless otherwise indicated; be sure to indicate what time scale (days, weeks, months, etc.) you used. Since it is not stated in the data documentation, you can assume that the measurement units of beta-carotene and vitamin E are micrograms per deciliter ( μ g / dl). 1. Effect of time on beta-carotene levels (a) For the subjects who received dose 0 (no beta-carotene supplementation): i. Draw a spaghetti plot of individual beta-carotene trajectories over time.
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