When back-testing the calibration quality of rating systems two-sided statistical tests can detect over- and underestimation of credit risk. Some users though, such as risk-averse investors and regulators, are primarily interested in the underestimation of risk only, and thus require one-sided...

When back-testing the calibration quality of rating systems two-sided statistical tests can detect over- and under-estimation of credit risk. Some users though, such as risk-averse investors and regulators, are primarily interested in the under-estimation of risk only, and thus require one-sided...