34.
If the credit institution employs statistical models in the rating process, the credit institution shall document their methodologies. This material shall: provide a detailed outline of the theory, assumptions and/or mathematical and empirical basis of the assignment of estimates to grades, individual obligors, exposures, or pools, and the data source(s) used to estimate the model; establish a rigorous statistical process (including out-of-time and out-of-sample performance tests) for validating the model; and indicate any circumstances under which the model does not work effectively.
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Source: EUR-Lex (Cellar) · retrieved 2026-10-09 · Text as adopted (Official Journal); later amendments are not incorporated in this text.