3.2.2. Frequency distribution

Frequency distribution table and frequency distribution chart preparation:

(1) Calculate the total pitch (rang,r).

(2) Determine the number of group segments and the group distance: usually the number of groups to take 8~15 group is appropriate. Group spacing/Group segment number

(3) determine the upper and lower bounds of the group segment: the starting and ending points of each group segment, respectively called the lower and upper limit of the group segment; the first set of segments must include the minimum value, and the last set of segments must include the maximum value.

(4) Statistics of each group segment frequency (frequency)

(5) Calculate the frequency of each group (percent)

(6) Calculate the cumulative frequency (cumulative frequency) and the cumulative frequencies (cumulative percent)

3.2.2. Frequency distribution