For the data in Table 4-3, treat the pair of variables, breathlessness and wheeze, as a four-category response variable, and break it up into three binary comparisons : (i) no symptoms vs. at least one, (ii) both vs. exactly one, (iii) only breathlessness vs. only wheeze. (a) For each, fit a linear logit model in which the nine categories of age are coded as x = -4, – 3,. . . ,4. (b) Compare the overall fit of the six-parameter model from part (a) with the models fit to the data in Chapter 4.
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