import statistics

def mod2(list1, list2):
    n = min(len(list1), len(list2))
    if n == 0:
        return 0.0
    x = list1[:n]
    y = list2[:n]
    
    try:
        correlation = statistics.correlation(x, y)
    except statistics.StatisticsError:
        correlation = 0.0
    
    return correlation