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Unformatted text preview: Final Exam, April 2003 Categorical Data Analysis for Epidemiologic Studies, CHL5407H INSTRUCTIONS • You have until 3 p.m. to complete this exam. • Show all of your work so that partial credit can be given. • Clearly state any assumptions you make in answering a question. • This is an open book exam. 1 1. Suppose that the women who gave birth at Baystate Medical Center in 1986 were considered for selection into a pair-matched case-control study. Suppose also that women who gave birth to low-weight infants were selected to be cases and matched with randomly selected women of the same age who gave birth to a normal weight infant (i.e. controls). Data on mother’s race is provided in Table 1 for each of the 56 matched pairs. (a) Use the data provided in Table 1 to construct an hypothesis test comparing the risk of having a low weight baby for black mothers (Race=2) versus the risk of having a low weight baby for mothers in the Other race category (Race=3). Clearly state the null and alternative hypotheses and provide a brief interpretation of your results. (b) What is being estimated by the two regression coefficients in the SAS output of Appendix 1? Table 1, Mother’s classification by race for each matched pair Cases White Black Other Controls (Race=1) (Race=2) (Race=3) Total-----------------+--------+--------+---------+...
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This note was uploaded on 11/20/2011 for the course STATISTICS ST3241 taught by Professor Manwai's during the Spring '11 term at National University of Singapore.
- Spring '11