Function densityLogNormal

docs/app/js/sanddance-app.js:119481–119487

(value, mean, stdev)

    return Math.exp(mean + sampleNormal() * stdev);
}
function densityLogNormal(value, mean, stdev) {
    if (value <= 0) return 0;
    mean = mean || 0;
    stdev = stdev == null ? 1 : stdev;
    const z = (Math.log(value) - mean) / stdev;
    return Math.exp(-0.5 * z * z) / (stdev * SQRT2PI * value);
}
function cumulativeLogNormal(value, mean, stdev) {
    return cumulativeNormal(Math.log(value), mean, stdev);
}