Where One Term Ends and the Next Begins, Decision Rules FAQ - Quick Answers on TUR, Guardbands, and Risk ("Part 8") Seven parts generate questions. Here are the ones that show up most, with short answers and a pointer to the part that carries the long version. It’s also the credits section, hence part 8 […]
Where One Term Ends and the Next Begins, Part 7 of 7: PFA and PFR Explained: Probability of False Accept and Reject A kicker makes 97 % of his field goals from the 35-yard line. This kick is from the 35, and it sails wide. Based on the population data alone, you would have said it […]
Where One Term Ends and the Next Begins, Part 6 of 7: Guardband Calculation Ask a field goal kicker about the wind. The goal posts never move. But a kicker facing a strong crosswind aims inside the upright to compensate for the drift he knows is coming. That aim point is the acceptance limit. The […]
Where One Term Ends and the Next Begins, Part 5 of 7: Decision Rule Selection - Which Rule to Use and When "Would you tell me, please, which way I ought to go from here?" Alice asks the Cheshire Cat. "That depends a good deal on where you want to get to," the Cat says. […]
Where One Term Ends and the Next Begins, Part 4 of 7: Test Uncertainty Ratio (TUR) - A Screen, Not a Decision Rule Figure 7. Consumer risk against accuracy ratio. The curve passes through roughly 1 % consumer risk near a 3:1 ratio, the relationship Hayes worked on. Jerry Hayes of the United States […]
Where One Term Ends and the Next Begins, Part 3 of 7: Bias vs Uncertainty - Why Compensation Is Not Padding Picture two bathroom scales. The first reads 2 lb heavy every single time, dead consistent. The second is perfectly centered on average but jumps around by a pound either way. The first scale has a […]
Where One Term Ends and the Next Begins, Part 2 of 7: CMC vs Measurement Uncertainty: The Number on Your Certificate Pull up any accredited lab's scope of accreditation, and you will find a line for force: perhaps 0.002 % of applied, or 0.025 % of applied, or 0.05 % of applied. Many people read that line and […]
Where One Term Ends and the Next Begins A Seven-Part Series on Measurement Uncertainty, CMC, Bias, TUR, Decision Rules, Guardbands, and PFA/PFR A customer or someone who I hope is a friend wrote to me with a suggestion. There is a messy mix of terms in conformity assessment, and no single place that says where […]
