Empirical squared coefficient of error for fixed parameter values.

(A, B, C): Empirical squared coefficient of error of the 51 point patterns in the crowd counting dataset, for fixed sampling fractions f = 0.02, 0.04, 0.06 respectively. Population and sample sizes are shown on the x axis. Blue and red color represent initial number of quadrats n0 = 50, 100 respectively. Broken horizontal lines correspond to 5%, 10% and 15%, whereas the vertical broken is drawn at sample size Q = 50. (D, E, F): Analogous plots for nonempty quadrats n. Broken horizontal lines correspond to 20, 30 and 50 quadrats.