McCullagh and Nelder (1989, Sect. 14.5) describe an experiment by S. Arnold and P. Verrell on the interbreeding of southern Appalachian mountain dusky salamanders. Each male has six breeding opportunities and each female also has six opportunities. The incomplete crossed design is shown in Table 14.3, and the results for three experiments in Tables 14.4-14.6 of McCullagh and Nelder (1989). Use lmer (...) to estimate the male and female variance components for the first salamander-mating experiment. Is there any evidence of correlation for repeat observations on the same male? Is there any evidence of correlation for repeat observations on the same female?