Method calculateRegressionSlope

packages/benchpress/src/statistic.ts:28–42

(
    xValues: number[],
    xMean: number,
    yValues: number[],
    yMean: number,
  )

  }

  static calculateRegressionSlope(
    xValues: number[],
    xMean: number,
    yValues: number[],
    yMean: number,
  ) {
    // See https://en.wikipedia.org/wiki/Simple_linear_regression
    let dividendSum = 0;
    let divisorSum = 0;
    for (let i = 0; i < xValues.length; i++) {
      dividendSum += (xValues[i] - xMean) * (yValues[i] - yMean);
      divisorSum += Math.pow(xValues[i] - xMean, 2);
    }
    return dividendSum / divisorSum;
  }
}