hw4 - PubH 6470, Fall 2011 1 Homework 4: due Tuesday, 25...

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PubH 6470, Fall 2011 1 Homework 4: due Tuesday, 25 October Take-home midterm will be handed out on Thursday, 27 October, and due in class on Tuesday, 1 November. 1. OGTT categories. In HW 2, you classified individuals into categories according to the results of their OGTT (oral glucose tolerance test). In this problem, we will examine whether these categories are associated with body mass index (BMI). Download the spreadsheet OGTT2.xls containing data from adults with cystic fibrosis. OGTT categories are given in several ways: OGTT_category has 7 categories, as text strings; the numeric variable OGTTclass = 1 (Normal), 2 (Normal-Indeterminate), 3 (IGT), or 4 (CFRD); and IFG is an indicator for IFG status. a. Delete all patients with OGTTclass=2 . Make a table classifying patients according to IFG status and OGTTclass. This is called the design space. b. Fit the model BMI = OGTTclass IFG OGTTclass*IFG; and report the type III ANOVA table. Make a plot of studentized residuals from this model. Hint:
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hw4 - PubH 6470, Fall 2011 1 Homework 4: due Tuesday, 25...

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