Options - Estimate
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Stat > Control Charts > Rare Event Charts > T > T Chart Options > Estimate

Omits or includes certain observations to estimate the shape and scale. For example, if some observations are erratic due to assignable causes that you have corrected, you can prevent them from influencing the estimation of the event probability.

Caution

When you include or exclude rows using control chart > Data Options > Subset and also omit or use samples to estimate parameters, the omitted or used samples apply to the subsetted data. For example, you exclude subgroup 1 from your analysis (using control chart > Data Options > Subset), then decide to omit subgroup 2 from the parameter estimation (using control chart Options > Estimate). Because subgroup 1 is excluded from the control chart, the original subgroup 2 becomes the new subgroup 1. When you use control chart Options > Estimate, enter subgroup 1 as the subgroup to omit from parameter estimation.

Dialog box items

Omit the following subgroups when estimating parameters: Choose to specify observations to omit from the computations for the event probability, the enter individual observation numbers.

Use the following subgroups when estimating parameters: Choose to specify observations to computer the event probability, then enter individual observation numbers.