ABBA (A & B-basis)
The ABBA program (A- & B-Basis Analysis) performs statistical analysis of the experimental strength data and estimates A- & B-basis values using methodology described in MIL-HDBK-17 1F .
The ABBA program calculate A- & B-basis values from composite material strength data.A-basis and B-basis allowables are statistically based tolerance bounds of material strength data:
A-basis or T99: At least 99% of the population of material values is expected to equal or exceed this tolerance bound with 95% confidence.
B-basis or T90: At least 90% of the population of material values is expected to equal or exceed this tolerance bound with 95% confidence.
For composite materials, experimental data from different panels can be treated as batches. k-sample Anderson-Darling test is used to determine whether the data should be treated as structured or unstructured.
Unstructured data are modeled using a Weibull, normal or lognormal distributions. Structured data are modeled using analysis of variance (ANOVA) method. Mean value, standard deviation, and coefficient of variation are also calculated.
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