Question: Refer to Table 6.11. The Pearson test of independence has X 2 (I) = 6.88. For equally spaced scores, the CochranArmitage trend test has z

Refer to Table 6.11. The Pearson test of independence has X²(I) = 6.88. For equally spaced scores, the Cochran€”Armitage trend test has z²= 6.67 (P = 0.01). Interpret, and explain why results differ so. Analyze the data using a linear logit model. Test independence using the Wald and likelihood-ratio tests, and compare results to the Cochran€”Armitage test. Check the fit of the model, and interpret.

Table 6.11:

Degree of Infiltration Proportion High Clinical Change High Low 11 53 42 27 Worse 0.08 Stationary Slight improvement Mod

Degree of Infiltration Proportion High Clinical Change High Low 11 53 42 27 Worse 0.08 Stationary Slight improvement Moderate improvement Marked improvement 13 16 15 0.20 0.28 0.36 0.39 11

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