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HW Hint, Ch4 Ex 16

Several students have asked about how to do the comparison across models for the stack loss data, versus the data in Example 4.7, where each model has a single parameter, theta.

In the stack loss models, you have some regression parameters (betas) and also some fitted medians (mu_j) for each year. I would say, take a look at the betas, say beta_1, in each model. Also look at a couple of the mu's, say mu_21 because we know that is any outlying year, and one other mu_j in a non-outlying year for comparison.