Or: the relative standard deviation RSD is the coefficient of variation: the calculation formula of the coefficient of variation is cv = S/x (mean) × 100%.
This value is usually used to indicate the accuracy of analytical test results.
Average value: In the daily inspection and testing work, it is uncertain whether the test result is accurate, but an accurate result can be obtained through repeated measurements, and the arithmetic average value of the measured data can represent the overall average level.
Standard deviation: In actual measurement, if standard deviation is used, it can reflect the accuracy of test results. Measure the sample a limited number of times.
The sum of deviation squares of each measured data is divided by the number of data minus the square root of 1. Because the larger deviation can be more prominently reflected after the variance of the single data in the formula, the standard deviation can better explain the dispersion degree of the data, which is more common in practical use.