# accuracy

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## ac·cur·a·cy

(ak'kū-ră-sē), Do not confuse this word with precision.
The degree to which a measurement, or an estimate based on measurements, represents the true value of the attribute being measured. In the laboratory, accuracy of a test is determined when possible by comparing results from the test in question with results generated using reference standards or an established reference method.

## accuracy

[ak′yərəsē′]
the extent to which a measurement is close to the true value.

## accuracy

The degree to which, on average, a test represents the true value—i.e., is unbiased.

Lab medicine
The extent to which a value from a test reflects or agrees with the reference value of the analyte being tested, measured statistically by standard deviations; the proportion of correct outcomes of a method (often used interchangeably with concordance in two-by-two tables).

Accuracy is insufficient for describing the performance of medical tests and deciding when to use what, because accuracy has two separate components and depends on the prevalence of the condition for which the test is appropriate. The degree of reproducibility of test results, regardless of whether or not they are accurate, are measured statistically by the coefficient of variation; the degree to which a measurement (e.g., the mean estimate of a treatment effect) is true or correct. An estimate can be accurate, yet not be precise, if it is based upon an unbiased method that provides observations having great variation—i.e., not close in magnitude to each other.

## accuracy

Lab medicine The extent to which a value from a test reflects or agrees with the reference value of the analyte being tested, measured statistically by standard deviations; the proportion of correct outcomes of a method–often used interchangeably with concordance. See Coefficient of variation, Diagnostic accuracy, Inaccuracy, Two-by-two table. Cf Precision.

## ac·cur·a·cy

(ak'kyūr-ă-sē)
The degree to which a measurement represents the true value of the attribute that is being measured; refers to the closeness of an analytic result to an actual result.

## accuracy

the closeness with which an observation or a measurement of a variable approximates its true value. An important component of diagnostic tests. An accurate test implies freedom from both random and systematic error. See also precision.
References in classic literature ?
The Assault-and-Battery business, into which I was now forced to adventure for a livelihood, was somewhat ill-adapted to the delicate nature of my constitution; but I went to work in it with a good heart, and found my account here, as heretofore, in those stern habits of methodical accuracy which had been thumped into me by that delightful old nurse -- I would indeed be the basest of men not to remember her well in my will.
It is one of the many methods in which they employ this weapon, and the accuracy of aim which they achieve, even under the most unfavorable circumstances, is little short of miraculous.
I confess," replied the Missionary, fingering a number of ten-cent pieces which a Sunday-school in his own country had forwarded to him, "that I am a product of you, but I protest that you cannot quote Scripture with accuracy and point.
Whatever its scientific accuracy was, they were at present ignorant how it would answer with human beings.
I cannot here give references and authorities for my several statements; and I must trust to the reader reposing some confidence in my accuracy.
I have written the present volume because I have found no other that, to my mind, combines satisfactory accomplishment of these ends with a selection of authors sufficiently limited for clearness and with adequate accuracy and fulness of details, biographical and other.
And now I will not have you say that justice is duty or advantage or profit or gain or interest, for this sort of nonsense will not do for me; I must have clearness and accuracy.
When different people see what they call the same table, they see things which are not exactly the same, owing to difference of point of view, but which are sufficiently alike to be described in the same words, so long as no great accuracy or minuteness is sought.
But that other man's name, inquire as you please, you shall not hear; for the Highlander values a secret for itself and for the congenial exercise of keeping it I might go on for long to justify one point and own another indefensible; it is more honest to confess at once how little I am touched by the desire of accuracy.
What I dwell upon most,' says Jasper, pursuing his subject of romantic interest, 'is the remarkable accuracy with which you would seem to find out where people are buried.
I bear witness, in the most disinterested manner, to the excellence of the stratagem by which this unparalleled woman surprised the private interview between Percival and myself-- also to the marvellous accuracy of her report of the whole conversation from its beginning to its end.
Mrs General consequently found her means so much diminished, that, but for the perfect regulation of her mind, she might have felt disposed to question the accuracy of that portion of the late service which had declared that the commissary could take nothing away with him.

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