Parameter estimates table for Parametric Distribution Analysis (Right Censoring)

The parameter estimates for the distributions are as follows:
  • Scale: Exponential distribution
  • Shape and scale: Weibull distribution
  • Location and scale: Smallest extreme value, normal, lognormal, logistic, and loglogistic distributions
  • Threshold: 3-parameter Weibull, 2-parameter exponential, 3-parameter lognormal, 3-parameter loglogistic distributions

The parameter estimates define the best-fitting parameter estimates for the distribution that you select. All other parametric distribution analysis graphs and statistics are based on the distribution. Therefore, to obtain accurate estimates, the distribution that you select for the analysis must adequately fit the data.

You cannot determine from the estimated distribution parameters whether the distribution that you selected fits the data well. Use the distribution ID plot, probability plot, and goodness-of-fit measures to determine whether the distribution adequately fits the data.

Example output

Distribution: Lognormal

Parameter Estimates Standard 95.0% Normal CI Parameter Estimate Error Lower Upper Location 4.09267 0.0719681 3.95161 4.23372 Scale 0.486216 0.0606247 0.380799 0.620816


For the engine windings data, the engineer selected a lognormal distribution. For the temperature of 80° C, the location and scale parameters that define the best-fitting lognormal distribution are location = 4.09267 and scale = 0.486216.

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