exam1 - STAT 8620 Exam 1 Due Thursday, October 27 SHOW ALL...

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STAT 8620 Exam 1 – Due Thursday, October 27 SHOW ALL WORK Name: Do not discuss this exam with anyone other than your instructor. You may use any notes, books, journal articles etc., but you are not to collaborate! 8 10 12 14 16 18 0.2 0.4 0.6 0.8 1.0 1.2 Log(FEV1) vs Age Age log(FEV1) 1. Consider the data plotted above. These data are from the Six Cities Study of Air Pollution, which followed subjects’ respiratory health longitudinally over time. Here, we consider a subset of the data consisting of just one observation per subject (selected at random from that subject’s set of measurements) for the first 50 subjects in the dataset. Plotted is the natural logarithm of FEV1, the forced expiratory volume of air expelled in the first second of a breathing test, versus age. FEV1 is a commonly used measure of lung function. The plot suggests that log(FEV1) changes linearly with age up to a point at which it levels off or, perhaps, starts to decrease. The pattern suggests that of a piece-wise linear model with
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This note was uploaded on 11/13/2011 for the course STAT 8620 taught by Professor Hall during the Fall '11 term at University of Florida.

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exam1 - STAT 8620 Exam 1 Due Thursday, October 27 SHOW ALL...

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