If the model does not predict well, it wanders more or less diagonally from the bottom left to top right.
In practice, the curve lifts off the diagonal. The area under the curve is the indicator of the goodness of
fit; a value of 1 indicates a perfect fit.
If a partition contains a section that is all or almost all one response level, then the curve lifts almost
vertically at the left for a while. This means that a sample is almost completely sensitive to detecting
that level. If a partition contains none or almost none of a response level, ...
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