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Distribution Fitting

Find the distribution that best describes your data.

Where to find it

QXL Stat Tools → Statistical Tools → Distribution Fit/Calc → Distribution Fit

Distribution fitting estimates the parameters of a probability distribution from your data and reports how well it fits. You can either let Auto-Fit try every available distribution and rank the results, or fit one named distribution directly from the menu.

The full documentation lives in the Distribution Fit/Calc section:

• Auto-Fit: fit all distributions and compare
• Understanding Distribution Fit Results: reading the parameters, goodness of fit, and plots
• Named Distribution Fitting: fitting one chosen distribution
• Maximum Likelihood Estimates and AIC and BIC: the fitting and comparison math
• Calculation of Cpk, CPL, and CPU for Non-Normal Data: using a fitted distribution for capability
• The individual distribution pages (Normal, Exponential, Logistic, Log-Logistic, LogNormal, Weibull, Gumbel, Johnson) are listed on the Distribution Fit/Calc index

The companion Distribution Calculator (same ribbon menu) evaluates probabilities for a chosen distribution; its pages are in the same section.

See Also

• Distribution Fit/Calc
• Cpk/Histogram, which fits distributions as part of capability analysis