Figure 4

Breaks. Breaks are assigned to 1000 randomly generated N(6, 1) data points plus 20 randomly generated N(15, 1) data points using 15 bins and 3 different strategies. In the default scheme, (a), spaces the breaks evenly across the entire data range. In (b), breaks are chosen to ensure that roughly the same number of data points fall within each break. In (c) the top 1% of the data is placed in a single bin while the remainder is placed in equally spaced bins.