Parameter estimates reported in Sect. 1.5 were computed using the code in Exercise 1.4. Following recommendations in Sect. 18.5, the likelihood ratio statistic for treatment effects was computed using the code

Modify this code to obtain the likelihood-ratio statistic for site effects.

Data From Exercise 1.4

For the model (1.2), verify that the \(\mathrm{R}\) commands
return the same parameter estimates and the same standard errors in a slightly different format.

K