analytics.py 文件源码

def samples_are_normal(*samples, **options):
    """Test whether each sample differs from a normal distribution.

    Use both Shapiro-Wilk test and D'Agostino and Pearson's test
    to test the null hypothesis that the sample is drawn from a
    normal distribution.

    Returns:
        List of tuples (is_normal(bool),(statistic(float),pvalue(float)).

    """
    alpha = options.get('alpha', 0.05)
    results = []
    for sample in samples:
        (_, shapiro_pvalue) = shapiro_result = shapiro(sample)
        (_, normaltest_pvalue) = normaltest_result = normaltest(sample)
        results.append((
            not (normaltest_pvalue < alpha and shapiro_pvalue < alpha),
            shapiro_result,
            normaltest_result
        ))
    return results