Compare the results of the strategies

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Reference no: EM131732335

Question - Table 10.9 summarizes a study with variables age of mother (A), length of gestation (G) in days, infant survival (I), and number of cigarettes smoked per day during the prenatal period (S). treat G and I as response variables and A and S as explanatory.

1) Explain why a loglinear model should include the λ^AS term.

2) Fit the models (AGIS), (AGI, AIS, AGS, GIS), (AG, AI, AS, GI, GS, IS), and (AS, G, I). Identify a subset of models nested between two of these that may fit well.

3) Use (i) forward selection and (ii) backward elimination to build a model between two of the models listed in (b). Compare the results of the strategies, and interpret the models chosen.

Table 10.9 Data on Gestation and Infant Survival for Exercise
Age	Smoking	Gestation	Infant Survival
			No	Yes
< 30	< 5	≤ 260	50	315
		> 260	24	4012
	5 +	≤ 260	9	40
		> 260	6	549
30 +	< 5	≤ 260	41	147
		> 260	14	1594
	5 +	≤ 260	4	11
		> 260	1	124
Source: N. Wermuth, pp. 279-295 in Proc. 9^th International Biometrics Conference, Vol. 1 (1976). Reprinted with permission from the Biometric Society

Reference no: EM131732335

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