# 3 examples of 'pandas correlation between two columns' in Python

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``143def correlation(T, a, b, lagtimes):144    """145        computes the time correlation function of a and b146    """``
``7def test_corr_pandas():8    df = pd.DataFrame(9        {10            "x1": [1, 2, 3, 4, 5, 6, 7, 8],11            "x2": [0, 0, 0, 1, 0, 0, 0, 0],12            "y": [2, 3, 4, 6, 6, 7, 8, 9],13        }14    )1516    mod = Ridge().fit(df[["x1", "x2"]], df["y"])17    assert abs(correlation_score("x1")(mod, df[["x1", "x2"]])) > abs(0.99)18    assert abs(correlation_score("x2")(mod, df[["x1", "x2"]])) < abs(0.02)``
``130def correlation(x, y):131    stdev_x = standard_deviation(x)132    stdev_y = standard_deviation(y)133    if stdev_x > 0 and stdev_y > 0:134        return covariance(x, y) / stdev_x / stdev_y135    else:136        return 0  # if no variation,  correlation is zero``