Select 2D Histogram by from
the Graphs - Graphs of Input Data
If the currently selected variable is categorical (usually 10 or less categories), then STATISTICA will use those categories as the histogram intervals. If the variable has either more than 10 categories or the values are non-integers (continuous), then STATISTICA will divide the values into about 10 to 12 intervals based on the range of the values. These intervals are then used in the histogram.