Step 1: conduct sorting, statistics and water level data hierarchy:-The measuring data are sorted in descending order-Statistics the number of occurrences of the value of the water level-If the string figures long, large amplitude then classified into levels of equal magnitude and statistics the number of occurrences in each level-Number of occurrences 1 values (or value level is called the frequency-f)Step 2: calculate the frequency of each experimental area accumulated export value or each level value in the following formula:
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