What do you mean by measurement error?

The difference between the observed value or calculated value of a quantity and its true value refers to statistical error, that is, the number of times a quantity deviates from the standard value or specified value due to some errors or usually due to some uncontrollable factors in the process of measurement, calculation or observation.

Mathematically, the difference between the measured value or other approximate value and the true value is called error.

For measurement, people often take the true size of a quantity as the true value measured during observation. It is actually an ideal concept.

Extended data

main reason

1. Errors caused by human factors include misreading, miscalculation and parallax.

2. Measuring tool factors

Errors caused by measuring tool factors include calibration errors, wear errors and uncorrected errors before use.

3. Power factor

Deviation error due to contact force or contact used in measurement.

4, measuring factors

Errors caused by improper instrument design or placement during measurement, including cosine error and Abbe error.

5. Environmental factors

Due to the different environment or site, the possible errors include thermal deformation error and random error.

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