this._determinetwoSidedProbabilityBoundaryForWelchsT = function()

in resources/perf.webkit.org/public/shared/statistics.js [112:128]


    this._determinetwoSidedProbabilityBoundaryForWelchsT = function(t, degreesOfFreedom) {
        if (isNaN(t) || isNaN(degreesOfFreedom))
            return {t: NaN, degreesOfFreedom:NaN, range: [null, null]};

        let lowerBound = null;
        let upperBound = null;
        for (const probability in tDistributionByOneSidedProbability) {
            const twoSidedProbability = oneSidedToTwoSidedProbability(probability);
            if (t > this.minimumTForOneSidedProbability(probability, Math.round(degreesOfFreedom)))
                lowerBound = twoSidedProbability;
            else if (lowerBound) {
                upperBound = twoSidedProbability;
                break;
            }
        }
        return {t, degreesOfFreedom, range: [lowerBound, upperBound]};
    };