The Fitting Options panel of the Batch Fit wizard indicates which distributions to fit to each set of data. The Fitting Options panel has these settings:
Distributions To Fit — Indicates the distributions to use for fitting:
AutoSelect — Crystal Ball selects the best type of distribution for fitting
All Continuous — Fits the data to all those distributions in which every value in the distribution’s range is possible (these distributions are displayed as solid shapes on the Distribution Gallery)
All Discrete — Fits the data to all discrete (non-continuous) distributions in the Distribution Gallery (except Yes-No)
Choose — Displays another dialog from which you can select a subset of the distributions to include in the fitting.
Rank By Goodness-of-Fit Statistic — Indicates which ranking method to use for determining the best fit:
AutoSelect — Crystal Ball selects the best available goodness-of-fit statistic to use for ranking.
Anderson-Darling — Closely resembles the Kolmogorov-Smirnov method, except that it weights the differences between the two distributions at their tails greater than at their mid-ranges; use this method when you need a better fit at the extreme tails of the distribution.
Kolmogorov-Smirnov — Finds the largest vertical distance between the two cumulative distributions.
Chi-Square — Oldest and most common of the goodness-of-fit tests; gauges the general accuracy of the fit by breaking down the distribution into areas of equal probability and comparing the data points within each area to the number of expected data points.
Lock Parameters — When you select this box or click the Edit Parameters button, opens the Lock Parameters dialog, where you can select parameters to lock during fitting and specify their values.
Note: | If you know location, shape, or other parameter values that may help create a more accurate fit with certain distributions, select Lock Parameters and enter appropriate values in the Lock Parameters dialog. For details, see Locking Parameters When Fitting Distributions. |
Show comparison chart during fitting — When selected, opens a comparison chart that enables you to either accept the selected distribution (based on settings in the Fit Distribution dialog) or select another distribution (see Confirming the Fitted Distribution).
Back — Returns to the Input Data panel.
Next — Opens the Output Options panel.
Run — Runs the tool, automatically fitting distributions to the data and creating output of the assumptions and statistics.
When all Fitting Options settings are complete, click Next to open the Output Options panel.