Total available sample units for Accelerated Life Test Plan

The total available sample units are the number of units that you have available for your accelerated life test. The more units that you test, the better the precision of your reliability or percentile estimate. Minitab allocates those units across stress levels to create a set of optimal test plans.

Example output

Accelerated Life Testing Test Plans

Planning Distribution Distribution Intercept Slope Exponential -8 0.5
Uncensored data Arrhenius model Estimated parameter: Reliability at time = 1000 Calculated planning estimate = 0.964857 Design stress value = 45

Selected test plans: “Optimum” allocations test plans

Total available sample units = 100

1st Best “Optimum” Allocations Test Plan Test Percent Percent Sample Expected Stress Failure Alloc Units Failures 85 100 63.3333 63 63 105 100 3.9583 4 4 125 100 32.7083 33 33 Standard error of the parameter of interest = 0.0123437
2nd Best “Optimum” Allocations Test Plan Test Percent Percent Sample Expected Stress Failure Alloc Units Failures 85 100 68.3333 68 68 105 100 3.9583 4 4 125 100 27.7083 28 28 Standard error of the parameter of interest = 0.0124673
3rd Best “Optimum” Allocations Test Plan Test Percent Percent Sample Expected Stress Failure Alloc Units Failures 85 100 58.3333 58 58 105 100 8.9583 9 9 125 100 32.7083 33 33 Standard error of the parameter of interest = 0.0126711

Interpretation

For the capacitor data, 100 capacitors are available for testing.

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