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Weibull Analysis

STATGRAPHICS Rev. 5/29/2015 2013 by Statpoint Technologies, Inc. Weibull Analysis - 1 Weibull Analysis Summary .. 1 Data 3 Analysis Summary .. 4 Analysis Options .. 5 Weibull Plot .. 6 Frequency Histogram .. 9 Goodness-of-Fit Tests .. 10 Density Function .. 12 CDF .. 13 Survival Function .. 14 Log Survival Function .. 15 Hazard Function .. 16 Tail Areas .. 17 Critical Values .. 18 19 References .. 20 Summary The Weibull Analysis procedure is designed to fit a Weibull distribution to a set of n observations. It is commonly used to analyze data representing lifetimes or times until failure. The data may include censoring , in which some failure times are not known exactly due to removals of items from the test. The distribution is plotted and estimated percentiles are displayed. If desired, the data for more than one group may be specified. In such cases, a separate estimate of the distribution for each group will be derived.

Random censoring occurs when values are censored for various reasons, not falling into either the Type I or Type II mechanism. Type I - indicates that the data are “time-censored”, i.e., items have been removed from the test at a pre-specified time. If this type of censoring is selected, all of the censored

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