Select Continuous by Continuous from the Graphs - Graphs of Input Data - 2D/3D Histogram by menu to create a bivariate histogram for two continuous variables or if you want STATISTICA to perform an automatic categorization on the values of the variables for this bivariate histogram. Both selected variables will be divided into categories for this bivariate histogram. When a selected variable is categorical (usually 10 or fewer categories), STATISTICA will use those categories as the histogram intervals for that variable. If a variable has more than 10 categories or its values are non-integers (continuous), then STATISTICA will divide the values into approximately 10 to 12 intervals based on the range of the values.