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Is there any algorithm which I can use to smooth the ROC curve and maybe another algorithm to fix points which are below the reference (chance) line?

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  • $\begingroup$ Smells like plot manipulation =) You can just use LOESS as the general smoothing algorithm. $\endgroup$ – German Demidov Oct 1 '16 at 14:36
  • $\begingroup$ @GermanDemidov Can you explain me how to calculate the new roc curve using this algorithm? Maybe a simple example? $\endgroup$ – DimChtz Oct 1 '16 at 15:04
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Rufibach in arXiv:1103.1787 has, besides the description of a new smoothing method, a pretty good introduction with an overview of your options to smooth ROC curves. I suggest starting from there.

To "fix" the points below the diagonal you will need a more discriminative detector. You can't really fix bad data with statistics.

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