Exam MAS-I Practice Question 153

Study guide: Exam MAS-I

Determine which of the following statements about log-linear models for contingency tables are true.

I. For a table with 3 rows and 4 columns, the deviance of the independence model is compared with a chi-squared distribution with 11 degrees of freedom.
II. The independence model gives the same fitted counts whether the cell counts are treated as independent Poisson variables or as multinomial with the grand total fixed.
III. In a three-way table with classifying variables $A$ , $B$ and $C$ , the model $AB + C$ allows $A$ and $B$ to be associated but makes the pair $(A, B)$ independent of $C$ .
A) I only
B) I and II only
C) I and III only
D) II and III only
E) The answer is not given by (A), (B), (C), or (D)

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