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Accelerated Life Test PlansStat > Reliability/Survival > Test Plans > Accelerated Life Testing
Use accelerated life test plans to determine the number of test units and how to allocate these units across stress levels for an accelerated life test.
The data you collect can be censored or uncensored.
A time-censored or failure-censored test plan often gives precise results while minimizing testing costs.
Parameter to be Estimated
Percentile for percent: Choose to estimate a percentile, then enter the percent.
Reliability at time: Choose to estimate the reliability at a specified time, then enter the time.
Sample sizes or precisions as distances from bound of CI to estimate: Choose Sample size, Lower bound, or Upper bound, and enter either the sample size or the precision value. See Choosing the precision when estimating a percentile or Choosing the precision when estimating a reliability.
Distribution: Choose one of seven common distributions: Weibull (default), smallest extreme value, exponential, normal, lognormal, logistic, and loglogistic.
Relationship: Choose linear (no transformation, the default), Arrhenius, inverse temperature, or ln (power) transformation for the accelerating variable. See Transforming the Accelerating Variable.
Shape (Weibull) or scale (other distributions): Enter the shape (Weibull) or scale (other distributions). For the exponential distribution, Minitab does not expect an entry because there is no shape parameter.
Specify planning values for two of the following: Specify planning values for two of the model parameters. If you choose to specify planning values for two percentiles, they must be at different stress levels. See Specifying Planning Values.
Percentile: Enter a percentile. In Percent, enter a percent associated with the percentile. In Stress, enter the stress level.
Percentile: Enter a second percentile. In Percent, enter a percent associated with the percentile. In Stress, enter the stress level.
Intercept: Enter the intercept for the relationship with the accelerating variable. See Choosing the Slope and Intercept.
Slope: Enter the slope for the relationship with the accelerating variable. See Choosing the Slope and Intercept.