(1) Measurement error
The difference between the measurement result minus the measured true value is called the measurement error, which is called the error.
The measurement results are the result of people's knowledge, not only related to the quantity itself, but also related to measurement procedures, measuring instruments , measurement environment and measuring personnel.
The measured true value is a value that is consistent with the definition being measured. It is a complete representation of the definition of the quantity, which is exactly the same as the definition of a given specific quantity, and can only be obtained by perfect or perfect measurement. . In practice, the "contract true value" is used.
Error = measurement result - true value = (measurement result - population mean) + (overall mean - true value) = random error + systematic error
Random error: The difference between the measured result and the average of the results obtained by performing an infinite number of measurements on the same measurement under repetitive conditions. (resulting in dispersion in repeated observations)
Systematic error: Under repetitive conditions, the difference between the average of the results of an infinite number of measurements of the same measurement and the true value being measured is called the systematic error. (estimated value, with uncertainty)
(2) Correction of measurement results
Uncorrected result: Measurement result that has not been corrected for system error.
Corrected result: Measurement result after correction of systematic error.
Correction value is equal to negative systematic error
True value = measurement result + correction value = measurement result - error
The correction value can only compensate the system error to a limited extent.
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