Using the model in Table 6.14 and taking Table 6.15 as your guide, calculate the effect of hepatomegaly among those on placebo. Then, derive and calculate the contrast required to identify the effect...

Using the model in Table 6.14 and taking Table 6.15 as your guide, calculate the effect of hepatomegaly among those on placebo. Then, derive and calculate the contrast required to identify the effect of hepatomegaly among those on DPCA. Given these, derive and fit the linear contrast to test for interaction. How does it compare with the test of interaction for comparing the effect of DPCA treatment across hepatomegaly that was given in Sect. 6.2.10?