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Mechanical Testing for the Biomechanics EngineerAccuracy and Measurement Tools

Mechanical Testing for the Biomechanics Engineer: Accuracy and Measurement Tools CHAPTER 2 2.1 ACCURACY AND PRECISION Before discussing setting up and conducting biomechanics studies, it is important to understand how to use measurement tools in the laboratory to increase the accuracy and precision of the work. Accuracy is a term used to describe how close to the true value a measurement is; the more accurate the measurement, the closer it is to the true value (which may or may not be known). Precision is a term used to describe how close repeated measurements are to each other, independent of accuracy. The more precise the measurements, the closer they are to each other but not necessarily the true value. As such, measurements (and the equipment used to obtain them) will fit into one of four categories: a) neither accurate nor precise; b) precise but not accurate; c) accurate but not precise; or, d) accurate and precise. A common way to visualize these combinations is demonstrated in Figure 2.1 with the use of a dartboard. The goal is to throw as many darts at the target (center). In (a), the darts (indicated by yellow dots) are neither accurate nor precise. That is, they are not near the center target (accurate) nor http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png

Mechanical Testing for the Biomechanics EngineerAccuracy and Measurement Tools

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Publisher
Springer International Publishing
Copyright
© Springer Nature Switzerland AG 2015
ISBN
978-3-031-00534-3
Pages
19 –39
DOI
10.1007/978-3-031-01662-2_2
Publisher site
See Chapter on Publisher Site

Abstract

CHAPTER 2 2.1 ACCURACY AND PRECISION Before discussing setting up and conducting biomechanics studies, it is important to understand how to use measurement tools in the laboratory to increase the accuracy and precision of the work. Accuracy is a term used to describe how close to the true value a measurement is; the more accurate the measurement, the closer it is to the true value (which may or may not be known). Precision is a term used to describe how close repeated measurements are to each other, independent of accuracy. The more precise the measurements, the closer they are to each other but not necessarily the true value. As such, measurements (and the equipment used to obtain them) will fit into one of four categories: a) neither accurate nor precise; b) precise but not accurate; c) accurate but not precise; or, d) accurate and precise. A common way to visualize these combinations is demonstrated in Figure 2.1 with the use of a dartboard. The goal is to throw as many darts at the target (center). In (a), the darts (indicated by yellow dots) are neither accurate nor precise. That is, they are not near the center target (accurate) nor

Published: Jan 1, 2015

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