As follows:

Relative error refers to the ratio of absolute error caused by measurement to measured (agreed) true value multiplied by 100%, expressed in percentage. Generally speaking, relative error can better reflect the reliability of measurement. Let the measured result y subtract the measured agreed true value t, and the error or absolute error is δ. The relative error can be obtained by dividing the absolute error δ by the agreed truth value t.

Relative error = absolute error ÷ true value. Is the ratio of absolute error to true value (it can be expressed by percentage, one thousandth ratio and one millionth ratio, but it is usually expressed by percentage). Generally speaking, relative error can better reflect the reliability of measurement.

Relative error refers to the ratio of absolute error caused by measurement to measured (agreed) true value multiplied by 100%, expressed in percentage. Generally speaking, relative error can better reflect the reliability of measurement. Let the measured result y subtract the measured agreed true value t, and the error or absolute error is δ. The relative error can be obtained by dividing the absolute error δ by the agreed truth value t.

Absolute error not only indicates the magnitude of the error, but also indicates its positive and negative direction, which reflects the deviation of the measurement result from the true value in the same unit dimension and accurately indicates the actual deviation from the true value.

Relative error refers to "the ratio of absolute measurement error to true measurement value", that is, the error is equivalent to the percentage of absolute measurement error to true value (or given value) or expressed in order of magnitude, and it is a dimensionless value. Some measuring instruments are often expressed by reference error and decibel error in order to determine their accuracy or allowable error for practical use.

Reference error refers to the ratio of absolute error to a specific value (upper limit of measuring range or measuring range), which is expressed as a percentage and is another expression of relative error.

Decibel error is a form of expression, which is often used to express the relative error of measuring instruments such as radio and acoustics. To sum up, the above is the category of relative error: actual relative error; The relative error of numerical value is given; Reference error; Decibel error.