Your professor comments, “what appears as an interaction when a profile plot is made for the probabilities may not appear as an interaction when the ln(odds) are plotted.” Use an example with some...

Your professor comments, “what appears as an interaction when a profile plot is made for the probabilities may not appear as an interaction when the ln(odds) are plotted.” Use an example with some probabilities you make up to illustrate the professor’s meaning.

Suppose that in Example 13.4 the number of workers had been expressed in millions, that is, 2.850803 rather than 2,850,803. How would the estimated regression coefficients change?

Example 13.4

Bailer et al. (1997) published an article showing how Poisson regression could be an important tool in safety research. Table 13.8 shows their counts of fatalities in the agriculture, forestry, and fishing industries and estimates of the number of workers in those industries. Figure 13.4 graphs the rates per 1,000 workers (number of fatalities
 1; 000=number of workers). We would like to see that fatality rates are declining, but is there any evidence that this is so?