Figure 4.

Estimates of ${\hat{\theta }}_n^B$ plotted against k ($u_n=X_{n-k:n}$), of a sequence of length n = 1000, with block lengths $r_n=10,20,50,125,250$, for the [M1] process (upper left), [M2] process (upper right), [M3] process (lower left) and [M4](lower right).