import pandas as pd

s = pd.Series([0, 1, -2, 5, 10, -3])
s.cumsum()
>>>
	0     0
	1     1
	2    -1
	3     4
	4    14
	5    11
	dtype: int64

import pandas as pd

s = pd.Series([0, 1, -2, 5, 10, -3])
s.cummax()
>>>
	0     0
	1     1
	2     1
	3     5
	4    10
	5    10
	dtype: int64

df['Cumulative Frequency'] = df['Frequency'].cumsum()