When creating a 2D Histogram, you can choose to fit an equation to the histogram or smooth the histogram by selecting one of the predefined functions. (The maximum likelihood method is used to estimate the distribution parameters.)

Note that for the Beta distribution, the data are required to be in the valid range of 0<x<1. For the Gamma, Lognormal, Weibull, Extreme, and Rayleigh distributions, the valid range is x>0. If the data fall outside of the valid range, Statistica will give an error message ("Fit not drawn because of invalid range of values") in the title of the graph.