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Software Quality Assurance
PIi = Ws (Si / Ei ) + Wm (Mi / Ei) + Wt (Ti / Ei)
Ei = the no. of uncovered errors during the ith step
Si = the no. of serious errors
Mi = the no. of moderate errors
Ti = the no. of minor errors
Ws = Weighting factors for serious errors
Wm = Weighting factors for moderate errors
Wt = Weighting factors for trivial errors
= (PI1 + 2PI2 + 3PI3 + … + iPIi) / PS
Statistical Quality Assurance
Statistical Quality Assurance