Classification of measurement errors

(1) According to the expression of the error
1. Absolute error: The difference between the measured value of the measured parameter and the true value, and the absolute error directly indicates that the meter measurement value deviates from the actual size. For the same actual value, the absolute error of the measurement is small, then the measurement result is shown to be accurate. However, the absolute error can not be compared with the measurement quality of the same instrument with different range, nor can it be compared with the measurement quality between different types of instruments, because the absolute error of different dimensions cannot be compared.
2. Relative error: The absolute error of the measured parameter is expressed as a percentage of the measured truth ratio.
3. Citation error: The absolute error is expressed as a percentage of the meter range ratio.
(2) According to the occurrence of the error is divided into
1. System error
2. Random error
3. Negligence Error
(3) According to the source of the error
1. Instrument error 
2. Impact Error
3. Theoretical error and method error
4. Personal error
(4) According to the measured rate of change over time
1. Static error
2. Dynamic error

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