The rate of correct (incorrect) predictions made by the model over a data set (cf coverage) Accuracy is usually estimated by using an independent test set that was not used at any time during the learning process More complex accuracy estimation techniques, such as cross-validation and the bootstrap, are commonly used, especially with data sets containing a small number of instances
The degree of agreement of a measured value with the true or expected value of the quantity of concern (Taylor, 1987) The concept of accuracy includes both bias and precision
The difference between a set of representative values and the actual values The accuracy of a point location would be the difference between the point's coordinates in the GIS and the coordinates accepted as existing in the real world
A quantitative measure of the magnitude of error (how close the results of a measurement are to an accepted reference value): the correctness of an analysis system Accuracy includes both precision and (lack of) bias
(1) the degree to which the data and information collected about the performance of a teacher are precise and correct measures of performance and are free from error (2) one of four areas of standards in The Personnel Evaluation Standards: How To Assess Systems for Evaluating Educators by the Joint Committee on Standards for Educational Evaluation This area has eight sets of standards: Defined Role, Work Environment, Documentation of Procedures, Valid Measurement, Reliable Measurement, Systematic Data Control, Bias Control, Monitoring Evaluation Systems See Bias, Conflict of Interest, Credible, Error of Measurement, Feasibility, Propriety, Quality Check, Rater Effect, Utility, Verification
The ratio of a measured value to the true value A percentage of the measured value, surrounding the measured value, which is supposed to contain the correct value Also see: precision
The degree of conformance between the estimated or measured position and/or velocity of the platform at a given time and its true position or velocity Radionavigation system accuracy is usually presented as a statistical measure of system error and is specified as
If applied to paper maps or map databases, degree of conformity with a standard or accepted value Accuracy relates to the quality of a result and is distinguished from precision 5 If applied to data collection devices such as digitizers, degree of obtaining the correct value 6
- the ability of any test method, lab analysis, or analyzer, to yield the true value of the sample as a result of the measurement That is, the result of the measurement gives the true value within the error of the measurement The accuracy of any method is best determined by round-robin testing of that method
the closeness of a measured or computed value to its true value Accuracy cannot be determined from a sample, and usually remains unknown (See precision )
degree of conformity with a standard Accuracy relates to the quality of a result, and is distinguished from precision, which relates to the quality of the operation by which the result is obtained see Accuracy and Precisionfor further information
The measure of the correctness of data, as given by the difference between the measured value and the true or standard value
(mathematics) the number of significant figures given in a number; "the atomic clock enabled scientists to measure time with much greater accuracy"
A measure of the closeness of an individual measurement or the average of a number of measurements to the true value Accuracy includes a combination of random error (precision) and systematic error (bias) components that are due to sampling and analytical operations; the EPA recommends using the terms "precision" and "bias", rather than "accuracy," to convey the information usually associated with accuracy
The degree of agreement between a measured value and the true value; usually expressed as +/- percent of full scale
Accuracy is an important factor in assessing the success of data mining When applied to data, accuracy refers to the rate of correct values in the data When applied to models, accuracy refers to the degree of fit between the model and the data This measures how error-free the model's predictions are Since accuracy does not include cost information, it is possible for a less accurate model to be more cost-effective Also see precision
the quality of nearness to the truth or the true value; "he was beginning to doubt the accuracy of his compass"; "the lawyer questioned the truth of my account"
The state of being accurate; freedom from mistakes, this exemption arising from carefulness; exact conformity to truth, or to a rule or model; precision; exactness; nicety; correctness; as, the value of testimony depends on its accuracy
(mathematics) the number of significant figures given in a number; "the atomic clock enabled scientists to measure time with much greater accuracy
If someone or something performs a task, for example hitting a target, with accuracy, they do it in an exact way without making a mistake. weapons that could fire with accuracy at targets 3,000 yards away inaccuracy
The accuracy of information or measurements is their quality of being true or correct, even in small details. We cannot guarantee the accuracy of these figures. inaccuracy
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