Curves {double sigmoid curve} can look like double S. Double sigmoid curves start at minimum or maximum, always increase or decrease, and end at maximum or minimum. They have two inflection points, near which it grows linearly. Growth rate is zero in middle. Double sigmoid curves change exponentially at beginning and end and near middle. Amount or percentage N over variable x is N(x) = (x - d) * (1 - exp(-((x - d) / s)^2)), where d is average, and s is standard deviation.
Mathematical Sciences>Geometry>Plane>Curve>Kinds>Logistic
3-Geometry-Plane-Curve-Kinds-Logistic
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Date Modified: 2022.0224