Introduction to harmonic mean
The harmonic mean (harmonic mean), also known as the reciprocal mean, is the reciprocal of the arithmetic mean of the reciprocal of each statistical variable in the population. The harmonic mean is a type of mean. But the statistical harmonic mean, unlike the mathematical harmonic mean, is the reciprocal of the arithmetic mean of the reciprocal of the variable. Because it is calculated based on the reciprocal of the variable, it is also called the reciprocal mean. There are two types of harmonic mean: simple harmonic mean and weighted harmonic mean.