Would be nice to be able to integrate the area under the curve in linear and non-linear models.
Yes indeed to ease way to calculate the area betw two curves. (Algorithmically, it would be more or less like, for example, calculating the area enclosed by a polyline in Autocad (done frequently, etc. quick...)
an algorithm that at least does part of this is in ROC Curve analysis.
And also the area between two curves!
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