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Delta Method for Ratio Metrics in A/B Testing with Python

Computes the confidence interval for the difference between two ratio metrics using the delta method, with mock A/B test data.

delta-method ab-testing ratio-metrics

Python

import numpy as np
from scipy.stats import norm


def delta_method_ratio_delta(control: np.ndarray, treatment: np.ndarray, confidence: float = 0.95):
    """Estimate confidence interval for ratio metric using delta method.

    Args:
        control: numerator/denominator pairs from control group (n x 2 array)
       …

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