Shows the best fit for all distributions. Change the criteria for finding the best distributions with the Comparison Criterion option.
Fits all nonnegative distributions (Exponential, Lognormal, Loglogistic, Fréchet, Weibull, and Generalized Gamma) and shows the best fit. The option does not include DS or TH distributions. If the data have negative values, then the option produces no results. If the data have zeros, it fits all four zero-inflated (ZI) distributions, including the ZI Lognormal, ZI Weibull, ZI Loglogistic, and the ZI Fréchet distributions. For details about zero-inflated distributions, see Zero-Inflated Distributions.
Fits all defective subpopulation distributions. For details about defective subpopulation distributions, see Distributions for Defective Subpopulations.
Shows or hides data points in the probability plot. The Life Distribution platform uses the midpoint estimates of the step function to construct probability plots. When you deselect Show Points, the midpoint estimates are replaced by Kaplan-Meier estimates.
Toggles between the failure probability and the survival curves on the Compare Distributions probability plot.
The type of confidence interval shown on the Nonparametric fit probability plot (either pointwise estimates or simultaneous estimates).
Lets you change the confidence level for the entire platform. All plots and reports update accordingly.
k =The number of estimated parameters in the model; n = The number of observations in the data set.
For all three criteria, models with smaller values are better. The comparison criterion that you select should be based on knowledge of the data as well as personal preference. Burnham and Anderson (2004) and Akaike (1974) discuss using AICc and BIC for model selection.