|
|
Keywords:
Precision,
Hysteresis,
True,
Inaccuracy,
Bias
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.
The difference between the expected value of a parameter and its actual value.
The amount by which a measured value adheres to a standard.
(IEEE) (1) A qualitative assessment of correctness or freedom from error. (2) A quantitative measure of the magnitude of error. Contrast with precision. (CDRH) (3) The measure of an instrument's capability to approach a true or absolute value. It is a function of precision and bias. See: bias, precision, calibration.
The success in estimating the true value. The closeness of an estimate of a characteristic to the true value of the characteristic of the population.
The extent to which an experimental measure is free from error. go to glossary index
The ability of a measurement to match the actual value of the quantity being measured.
Represents how close the actual position of a nanopositioner is to the theoretical position to which it is expected to move. It is affected (or determined) by linearity error, hysteresis, abbe error, scale factor error and positioning noise, etc.
(see also validity) The extent to which a measurement, or an estimate based on measurements, represents the true value of the variable being measured.
the measure of how close an experimental value is to the true value.
Degree of conformity of a measure to a standard or true value; in other words, how close a predicted or measured value is to the true value.
In firearms using single projectiles at a given distance, is the measure of the dispersion of the group of projectiles fired. The optimum would be one hole no larger in diameter than a single projectile.
Closeness of agreement between the result of a measurement and the (conventional) true value of the measurement. Note 1. Use of the term precision for accuracy should be avoided. Note 2. True value is an ideal concept and, in general, cannot be known exactly. (Metrology, 1984)
Extent to which a measurement agrees with the accepted or correct value for that quantity, based on careful measurements by many people. Compare precision.
The characteristic of a measurement that tells how close an observed value is to a true value.
Degree to which an estimated, observed, or calculated value approaches the actual or true value (or what is believed to be the actual or true value).
The degree with which an instrument measures a variable in terms of an accepted standard value or true value; usually measured in terms of inaccuracy but expressed as accuracy; often expressed as a percentage of full-scale range.
Conformity with a standard or correctness in measurement. 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.
Quantity referring to the differences between the mean of a set of results or an individual result and the value which is accepted as the true or correct value for the quantity measured. Gold, Loening, McNaught and Sehmi, 1987 RT precision.
The extent to which a measurement agrees with the true value of the quantity being measured.
Indicates how closely an analytical or assay procedure approaches the true value for a particular sample. (Note that this requires knowing what the true value is.)
Refers to a measurement of the average correctness of data or an equation. See variance.
The discrepancy between the true value and the result obtained by measurement.
The degree of agreement between a measured value and a true, expected value.
Precision in the measurement of quantities and in the statement of physical characteristics. Accuracy is typically expressed in terms of error as a percentage of the specified value (e.g., 10 volts ± 1%), as a percentage of a range (e.g., 2% of full scale), as parts (e.g., 100 parts per million) or with absolute tolerances (e.g., 6.7kg ± 0.1kg).
The degree of agreement of a measured value with the actual expected value.
The degree of freedom from error. Accuracy is often confused with precision, which refers to the degree of preciseness of a measurement.
The degree of freedom from error. The total error compared to a theoretically true value. Contrast with and see precision for an example.
The degree of agreement between an individual measurement or average of measurements and the accepted reference value of the quantity being measured. See also precision.
the closeness of a measured value to the known "true" value of the measurand.
(of a test). The proportion of correctly classified patients based on the test and its threshold. The proportion of true positive classifications plus the proportion of true negative classifications. [See prevalence, sensitivity, specificity
difference between the actual value and the measured or expected value.
Freedom from error. Accuracy contrasts with precision; e.g., a four- place table, correctly computed, is accurate; a six-place table containing an error is more precise, but not accurate.
The extent to which results of a calculation or the readings of an instrument approach the true values of the calculated or measured quantities.
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.
The measure of a bullet's precision; the term describing a firearm's ability to shoot consistently where aimed.
Refers to how well your measurement of an object or phenomenon reflects its actual state. For example, it is important to have an accurate measurement of your feet in order to select well-fitting shoes. (See also Bias, Precision and Validity.)
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"
(mathematics) the number of significant figures given in a number; "the atomic clock enabled scientists to measure time with much greater accuracy"
The degree to which an indicated value matches the actual value of a measured variable. In instrumentation, the ratio of the error to the full-scale output, usually measured as + ___ percent of full-scale output.
condition or quality, of an action, of being correct, true, or exact. Accuracy is typically a judgment by a verbal community about an action, not a property of the action itself. Accuracy differs from effectiveness. Accuracy also forms one of the defining properties of fluency.
This is the deviation between the actual position and the theoretical position of each bit edge. The base accuracy of an encoder is traceable to the encoding disc. Accuracy is different from and is not directly related to resolution.
The degree of precision. Usually expressed, in terms of error, as a percentage of the specified value, or as a percentage of a range.
Degree of conformity of a measured value to an accepted standard value; or closeness of a reading or indication of a sensor to the actual value of the quantity being measured.
A paternity test is considered accurate when proper procedures are followed to ensure that the results of the test are correct. At GeneSys, each sample is independently tested two times and the data are compared for consistency before reporting. The test results, reported as allele sizes, are objective measurements and are reliable, reproducible, and accurate.
A measure of the difference between expected position and actual position of a motor or mechanical system. Motor accuracy is usually specified as an angle representing the maximum deviation from expected position.
degree of conformity with a standard, or the degree of correctness attained in a measurement. Accuracy relates to the quality of a result, as distinguished from precision.
Indicates how well a scale displays the correct results. Accuracy is the ability of the scale or balance to display a value that matches the ideal value for a known weight.
a measure of how close the results of an experiment are to the true value; a measure of the correctness of the result.
In mapping, the reduction of positional and attribute errors based on information sources and data input instruments. Data precision must reflect, not exceed its accuracy.
Quantity defining the limit that errors will not exceed. When applied to flow meters, accuracy is specified in either % of full scale or % of rate.
A measure of the precision with which genetic merit is predicted. Accuracy ranges from .01 (low) if no information is available, to .99 (high) if there is a large amount of performance information on the individual and its relatives. It is an expression of the reliability of the EPD. Accuracies indicate the level of confidence that the predicted EPD is near the true genetic potential of that animal. Accuracies are not available at this time.
Closeness of a measured value to the real value (see precision).
The difference between the reading of an instrument and the true value of what is being measured, expressed as a percent of full instrument scale.
The degree to which a measurement, or an estimate based on measurements, represents the true value of the attribute that is being measured. (See also Precision and Validity which are the two components of "Accuracy")
Accuracy normally refers to conformity of an indicated value to an accepted standard value. There is no indication in switch products; thus, instead, the term repeatability is used as the key performance measure.
A measure of how well one set of data matches another, particularly how well a set of predictions match the actual measures. Accuracy is not a simple subject, it is not the opposite of error and there are many ways to calculate accuracy with widely different results. The typical calculation of accuracy is 1-(abs(Predicted-Actual)/Actual), however this calculation breaks down if the Actual is zero (0). Another example of an accuracy calculation is "Relative Accuracy" which is 1-(abs(Predicted-Actual)/(Range of Actual).
A computed indicator of the system's ability to place the correct mate within a specified position on the candidate list as a result of the matching process.
A measure of the similarity of an instrument reading to the actual value for that reading. The accuracy of temperature measurement indicators on thermal imagers is affected by emissivity, the distance from the object, the angle of the object and a number of other factors.
the agreement between a mean measured value and a true or accepted value as quantified by error. Related to determinate errors and quantified by bias.
The extent to which the measured value of a quantity agrees with the accepted value for that quantity.
1. If applied to paper maps or map databases, degree of conformity with a standard if accepted value. Accuracy relates to the quality of a result and is distinguished from precision. 2. If applied to data collection devices such as digitizers, degree of obtaining the correct value.
The degree of agreement between an observed value and an accepted reference value. Accuracy includes a combination of random error (precision) and systematic error (bias), components which are due to sampling and analytical operations (NELAC, 2001). Note: Because the true toxicity (unlike, for example, mass) of a material cannot be determined this term is generally not considered applicable to toxicity testing. Consequently "true" values for laboratory evaluation studies are typically mean or median values of participating labs.
Those attributes of a system that provide the required precision in calculations and outputs.
the closeness by which a set of measurements approaches the true value; if the true value is not known the accuracy is taken to be the realistic estimation of that closeness.
Accuracy is the maximum allowable set point deviation of a unit from the actual value under one given set of environmental and operational conditions.
|
