Precision

[jīng mì dù]

It refers to the degree of conformity between the measured value and the true value

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Precision means measurement Reproducibility , is a guarantee Accuracy Of precondition However, high precision may not guarantee high accuracy. Good precision is a prerequisite to ensure good accuracy. Generally speaking, Measurement precision If not, it is impossible to have good accuracy. On the contrary, the measurement precision is good, but the accuracy is not necessarily good, which indicates that the measurement is in progress random error Small, but systematic error Larger.

The accuracy of the size of the parts to be processed, that is Admissible error The size of the tolerance error is large, the precision is low, and the tolerance error is small, the precision is high; Referred to as "precision", commonly used standard deviation (standard deviation, SD or S); relative standard deviation (relative standard deviation， RSD ）Represents. In analysis, RSD is often used to indicate precision. It can also be referred to as precision. Description measured data Degree of dispersion. Precision is Accuracy It is another part of, and is an important part of. Precision is independent under specified conditions measurement result Consistency between. Precision refers to the difference between the measured values Degree of dispersion 。 It can be seen that the essence of precision lies in its Data accuracy At the same time, in many cases, it can be reflected through accuracy, so it is often called accuracy , referred to as precision.^[1]

Chinese name: Precision
Foreign name: precision
Interpretation: The size of processed parts is accurate degree

Abbreviation: " accuracy "
Features: independent measurement result Consistency between
See publications: Physics Terms (Second Edition), Science Press
Time of publication: 1996^[3]

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one essential information
two Relationship with accuracy

essential information

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For different lay down a condition , have different precision measurement. The most important measure of precision is Repeatability and Reproducibility 。

Repeatability and reproducibility are two aspects of precision Extreme value , respectively corresponding to two extreme measurement conditions: the former represents almost the same measurement conditions (called Repeatability condition ）Repeatability measures measurement result Minimum difference of; The latter means that under completely different conditions (called reproducibility conditions), it measures the maximum difference of measurement results. In addition, it can also consider Intermediate state The so-called condition Intermediate precision Conditions. It refers to the degree to which the measured values are consistent with each other when repeatedly measuring the same amount. During characterization and determination random error Size of.

Precision is usually calculated by arithmetic Average difference , extremely poor standard deviation Or variance. The precision is related to the measured magnitude and concentration. Therefore, when reporting the precision, it is necessary to indicate the size and concentration of the measured quantity to obtain the precision.

chemical analysis Precision refers to the use of specific analysis program The consistency between the measured values obtained by repeated analysis and determination of homogeneous samples under controlled conditions. Precision depends on Accidental error (except negligence), indicating measurement result Reproducibility of. Intraday precision and Daytime precision Determination of Reference substance Repeat the injection for three times for three consecutive days to determine the intra day and inter day precision.^[2]

Relationship with accuracy

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Accuracy It refers to the degree of conformity between the measured value and the true value.

Accuracy and precision are two different concepts, but there is a certain relationship between them. It should be noted that the higher the accuracy of the measurement, the closer the measurement results are True value 。 But we can't absolutely believe that the precision is high and the accuracy is also high, because systematic error On the contrary, if there is no better precision, it is rarely possible to obtain higher accuracy. It can be said that precision guarantees accuracy precondition 。

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