Measurement practice / Chapter / Three notes
General Metrology
Three practical notes on accuracy and precision, gage repeatability and reproducibility, and meaningful comparisons across measurement systems.
Start with accuracy and precisionUnderstand the measurement before comparing the result.
Separate systematic effects from measurement spread, compare that spread with the tolerance, and design a study that represents real operation. Then use agreement and correlation methods for the questions they can answer. The chapter includes an editable crossed Gage R&R template with average-and-range and ANOVA calculations.
- 01 Application note + calculator
Accuracy, Precision, and Process Capability
Separate measurement bias and spread before comparing either with an engineering tolerance.
Read the note - 02 Application note + calculator
Measurement System Analysis and Gage R&R
Design a repeatable study that separates measurement variation from differences between parts.
Read the note - 03 Application note + calculator
Round Robin Studies and Correlation
Distinguish measurement agreement from statistical association when comparing instruments and product levels.
Read the note
A useful result includes its measurand, conditions, reference, and uncertainty. Your application determines whether it is fit for purpose.
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