A roundup of recent changes to the Six Sigma Study Guide Green Belt and Black Belt courses, in two parts. Here are a few updates we made recently. We think they will make a real difference to your studying. Some came from member requests. Others came from our regular go to the Gemba walks, where (more…)
Control chart constants are the multipliers that turn an average range or an average standard deviation into 3-sigma control limits. They depend only on the subgroup size n. A2, D3 and D4 build the X-bar and R chart. A3, B3 and B4 build the X-bar and s chart. E2 and D4 (for n = 2) (more…)
Attribute agreement analysis explained: repeatability, reproducibility, percent agreement, Cohen’s and Fleiss’ kappa, worked examples and study design.
Acceptance sampling explained: single, double and sequential plans, AQL, LTPD, producer’s and consumer’s risk, OC curve with a worked example, and Z1.4.
Control chart rules explained: the Western Electric and Nelson rules, one clear rule set to use, and the false alarm trade-off of adding more rules.