Estimation Test Plansoverview how to example see also
Estimation Test PlansStat > Reliability/Survival > Test Plans > Estimation
Use to determine the number of test units that you need to estimate percentiles or reliabilities with a specified degree of precision.
The data you collect can be censored or uncensored.
A time-censored or failure-censored test plan often gives precise results while minimizing your 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.
Precisions as distances from bound of CI to estimate: Choose to estimate the precision between the estimate and lower bound or the estimate and upper bound, then enter the precision value. See Choosing the precision when estimating a percentile or Choosing the precision when estimating a reliability.
Assumed distribution: Choose one of seven common distributions: Weibull (default), exponential, smallest extreme value, normal, lognormal, logistic, and loglogistic.
Specify planning values for two of the following: Specify one value for the exponential distribution or two values for the other distributions. See Specifying Planning Values.
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.
Scale (Weibull or expo) or location (other dists): Enter the scale (Weibull or exponential) or location (other distributions).
Percentile: Enter a percentile. In Percent, enter a percent associated with the percentile.
Percentile: Enter a second percentile. In Percent, enter a percent associated with the percentile.