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Steven Maijoor, ESMA Chair, said: “The Guidelines clarify how CRAs should validate and review their methodologies, furthering ESMA’s work towards CRAs improving the quality of credit rating methodologies and credit ratings for the purpose of protecting investors and financial stability.”
The Guidelines will increase the quality of the quantitative measures used by requiring CRAs to review their methodologies:
· discriminatory power, meaning their ability to rank the rated entities in accordance to their future status (defaulted or not defaulted) at a predefined time horizon.
· predictive power, by comparing the expected behaviour of the credit ratings to the observed results; and
· historical robustness, through the assessment of other elements of the methodology such as the stability of the credit ratings assigned by the methodology.
ESMA acknowledges there are challenges in validating methodologies with limited quantitative evidence and in such cases requires CRAs to consider data enhancement techniques as well as techniques enabling them to perform quantitative measures for demonstrating the discriminatory power of their methodologies. ESMA expects that even in cases where there is limited quantitative evidence, CRAs should demonstrate the robustness of their methodologies.
ESMA considers implementing the Guidelines will raise the overall standard of validation by CRAs while allowing sufficient flexibility for the CRAs to choose the approaches that are the most relevant to their business, size and activity areas.