def correlations(list1,list2):
    """ Расчет коэффициента корреляции"""
    n= min(len(list1), len(list2))
    list1 = list1[:n]
    list2 = list2[:n]
    mean1 = sum(list1)/n
    mean2 = sum(list2)/n
    chislitel = sum((list1[i] - mean1) * (list2[i] - mean2) for i in range(n))
    znamenatel1 = sum((x - mean1) ** 2 for x in list1)
    znamenatel2 = sum((y - mean2) ** 2 for y in list2)
    if znamenatel1 == 0 or znamenatel2 == 0:
        return 0
    return chislitel/(znamenatel1 * znamenatel2) ** 0.5