Accuracy and precision

The accuracy and precision of measurements have special meanings in the fields of science, engineering, industry and statistics. 

The accuracy of a measurement system is how close it gets  to a quantity's actual (true) value.JCGM 200:2008 International vocabulary of metrology — Basic and general concepts and associated terms (VIM) 

The precision of a measurement system is the degree to which repeated measurements give the same results.

A measurement system can be accurate but not precise, precise but not accurate, neither, or both. For example, if an experiment contains a error in the way it is done, then increasing the sample size generally increases precision but does not improve accuracy. The end result would be a consistent, yet inaccurate, set of results from the flawed experiment.  Eliminating the systematic error improves accuracy but does not change precision.

A measurement system is valid if it is both accurate and precise. Related terms include bias (non-random or directed effects caused by a factor or factors unrelated to the independent variable) and error (random variability).

 Related topics 
The terminology is also applied to indirect measurements—that is, values obtained by a computational procedure from observed data.

In addition to accuracy and precision, measurements may also have a measurement resolution, which is the smallest change in the underlying physical quantity that produces a response in the measurement.

 Different meanings of 'precision' 
The word "precision" also refers to how fine the measurement is made, as the resolution of the measurement, such as to the nearest meter, centimeter, or yard, foot, inch, or nanometer. 

In the case of full reproducibility, such as when rounding a number to a representable floating point number, the word precision has a meaning not related to reproducibility. For example, in the IEEE 754-2008 standard, it means the number of bits in the significand (number of digits in the amount), so it is used as a measure for the relative accuracy with which a number can be shown.

Related pages
Precision (numbers)
Significant figures
Pi

References

 Other websites 

 BIPM - Guides in metrology - Guide to the Expression of Uncertainty in Measurement (GUM) and International Vocabulary of Metrology (VIM)
 "Beyond NIST Traceability: What really creates accuracy"  - Controlled Environments magazine
 Precision and Accuracy with Three Psychophysical Methods
 Guidelines for Evaluating and Expressing the Uncertainty of NIST Measurement Results, Appendix D.1: Terminology
 Accuracy and Precision

Category:Critical thinking
Category:Measurement