![]() The Lead Moss data contains the levels of lead found in 70 fern moss specimens (in micrograms of lead per gram of moss tissue) collected from the mountain slopes, as well as the elevation of the moss specimen (in feet) and the direction (1 if east, 0 if west) of the slope face. Before we do so, however, we first should evaluate the model.Ī study of atmospheric pollution on the slopes of the Blue Ridge Mountains (Tennessee) was conducted. That is, we want to use our estimated model to draw conclusions about the larger population of depressed individuals. Of course, our primary goal is not to draw conclusions about this particular sample of depressed individuals, but rather about the entire population of depressed individuals. The interaction is exhibited graphically by the "nonparallelness" (is that a word?) of the lines. That is, age appears to interact with treatment in its impact on treatment effectiveness. In short, the effect of age on the predicted treatment effectiveness depends on the treatment given. For patients in this study receiving treatment C, the effectiveness of the treatment is predicted to increase by 1.03 units for every additional year in age. ![]()
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