honake

import numpy as np
import pandas as pd
import matplotlib.pyplot as plt

def broadbent_adstock(grp, r):
    adstock = np.zeros(len(grp))
    adstock[0] = grp[0]
    for i in range(1,len(grp)):
        adstock[i] = grp[i] + r*adstock[i-1]
    return adstock