Hi could you please help me understand the explanation in examiner's report of this question? Thanks in advance!
Hello Priyanka The main point here is that the conditional mean of Y decreases as the value of x increases. Assuming that this remains true as the distribution of X changes (the question is about what happens if X shifts towards higher values, which means the distribution of X is changing), then the mean rainfall will decrease with either copula. We can also then compare how the conditional mean decreases with each copula. It is a similar amount of decrease for the bulk of the range of x values plotted; however, the decrease under the student's t copula is larger for the higher values of x. Hope this helps! Andy
