Some possible shapes of the U-smile plot.

<p>The U-smile plot of the BA or RB coefficients represents the effect of adding a new variable to a reference model. Its shape can indicate improved prediction for both classes (double smile – panel a) or either class with no changes in the other (smile + flat line, flat line + smile – panels...

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Bibliographic Details
Main Author:	Barbara Więckowska (536264) (author)
Other Authors:	Katarzyna B. Kubiak (18585116) (author), Przemysław Guzik (18585122) (author)
Published:	2025
Subjects:	Medicine Science Policy Infectious Diseases Biological Sciences not elsewhere classified Mathematical Sciences not elsewhere classified proved highly effective net reclassification index nested setting ). matthews correlation coefficient heart disease dataset generated random variables certain traditional measures higher imbalance levels defined imbalance levels imbalanced binary classification xlink "> real using real data reference model overfitted entire imbalance range brier skill score smile method indicated reference prediction model majority class outnumbers new variable added reference model imbalance range class imbalance smile method majority class variable selection prediction improvement imbalanced datasets smile plots smile plot minority class event class class balance weighting factor useful tool seven pre reference models ratio test previously developed point size life problems level approach
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Some possible shapes of the U-smile plot.

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