Additional content of the internal IRC model
13. The internal model to capture the incremental default and migration risks should reflect the nonlinear impact of Options, structured Credit Derivatives and other positions with material nonlinear behaviour with respect to price changes. The Authorised Person should also have due regard to the amount of model risk inherent in the valuation and estimation of price risks associated with such products.
14. The internal model should be based on data that are objective and up-to-date.
15. As part of the independent review and validation of their internal models used for purposes of this Chapter, an Authorised Person should in particular do all of the following:
a. validate that its modelling approach for correlations and price changes is appropriate for its portfolio, including the choice and weights of its systematic risk factors;
b. perform a variety of stress tests, including sensitivity analysis and scenario analysis, to assess the qualitative and quantitative reasonableness of the internal model, particularly with regard to the treatment of concentrations. Such tests should not be limited to the range of events experienced historically; and
c. apply appropriate quantitative validation, including relevant internal modelling benchmarks.
16. The internal model should be consistent with the Authorised Person's internal risk management methodologies for identifying, measuring, and managing trading risks.
17. Authorised Persons should document their internal models so that their correlation and other modelling assumptions are transparent to the Regulator.
18. The internal model should conservatively assess the risk arising from less liquid positions and positions with limited price transparency under realistic market scenarios. In addition, the internal model should meet minimum data standards. Proxies should be appropriately conservative and may be used only where available data is insufficient or is not reflective of the true volatility of a position or portfolio.