Figure 2. Distribution of the three estimated parameters (j^, ^e, l ^) of all subjects. Both the parameter j and e are restricted to the interval [0, 1]. Hence, 0pj^, ^ep1 are distributed as shown in the left and middle panels above. However, l is only restricted to be non-negative; hence, basically, there is no upper bound for l ^, and in our case l ^ ranges from a minimum of 0.01 to a maximum of 42,736. Out of the 120 l ^s, 37 are greater than 5, 6 are greater than 100 and 3 are greater than 10,000. With this wide distribution, it is hard to plot the entire histogram with the same scale. We decide to plot it only up to a maximum of 5, and show the rest together as “bigger than 5.” Therefore, the rightmost spike in the right panel above actually refers to the distribution of “lX5.”