Frequency definition
Frequency (Frequency), also known as "frequency". Refers to the number of occurrences of the number (flag value) representing a certain feature in the variable value. The frequencies arranged in groups in sequence constitute a frequency sequence, which is used to illustrate the strength of the effect of each group of flag values on all flag values. The sum of the frequency of each group is equal to the total number of units in the whole. The frequency representation method can be in the form of a table or a graph.