STAT 431
American University Of Health Sciences
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Stat 431 Assignment 4 solutions|100% correct
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Stat 431 Assignment 4 solutions 
1. [16 marks] 
(a) [4 marks] 
We start with fitting the log-linear model without a three way interaction term. This 
model results in a deviance test 
D = 26.690, p − value = P(χ 
2 
8 > D) = 0. < 0.05 
So we reject the H0: the model without the three way interaction fits as well as the 
saturated model (which is the model with three-way interaction). 
This implies that the three way interaction between age, breathlessness and coughing 
is necessary to d...
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