Pdf flatten

[Felipemendezrios]

When a rating shift has been detected, the associated uncertainty could be so large that it may be better to exclude these shifts, be careful not to exclude the bimodal distribution. This leads us to consider integrating a bimodal behavior analysis criterion.

[Felipemendezrios]

A process has been implemented in the package to remove certain recessions depending on their performance (RMSE weighted ), giving more weight to long recession curves. It reduces the number of pdf flattenings, but another process could be added to avoid even more.