Best Fit Distribution

If the Data Type for a Histogram in RocPlane is one of the Calculated Data Types (i.e. Safety Factor, Wedge Weight, etc.), then a Best Fit Distribution can be determined using the Kolmogorov-Smirnov Goodness of Fit test.

The Goodness of Fit test will determine which one of the Probability Density Functions available in RocPlane (Normal, Uniform, Triangular, Beta, Exponential, Lognormal) gives the best fit to the data. The distribution which best fits the data will be displayed on the histogram and listed at the bottom of the plot. The Kolmogorov-Smirnov test is described in Law and Kelton, (1991).

The Best Fit Distribution option is available in the right-click menu, the Chart menu, and in the Histogram Plot Parameters dialog, when you initially generate a Histogram.

Interval markers can be displayed on the Best Fit Distribution with the Markers option.

NOTE: The Best Fit Distribution option is NOT available for Histograms of Input Data variables, since these results are based on a sampling of the Probability Density Function already specified in the Input Data dialog. For Input Data variables, the Input Distribution can be displayed.