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accuracy and precision
Sign in to saveAlso known as Inaccuracy and imprecision, accuracy, accurate, precision and accuracy, accuracy vs. precision, precision vs. accuracy, test inaccuracy, accuracy (trueness and precision)
measures of observational error
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Accuracy is the proximity of measurement results to the accepted value; precision is the degree to which repeated (or reproducible) measurements under unchanged conditions show the same results. Accuracy and precision are measures of observational error; accuracy is how close a given set of measurements is to the true value and precision is how close the measurements are to each other.
The International Organization for Standardization (ISO) defines a related measure: trueness, "the closeness of agreement between the arithmetic mean of a large number of test results and the true or accepted reference value."