Explanation:
The correct information to validate the bank's WCDR estimation using Vasicek's model includes the probability of default (PD), asset correlation (ρ), the confidence level (X), and the methods used by the bank to derive these parameters. The WCDR calculation is sensitive to these inputs, and thus, their validation is critical for verifying the accuracy of the capital requirements estimated under the Basel II framework.
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Q.6041 A regulatory auditor is reviewing the capital adequacy of a mid-sized bank under the Basel II framework. The bank has used Vasicek's model to estimate capital requirements for a corporate loan portfolio. The auditor intends to validate the bank's calculation, which includes a worst-case default rate (WCDR) derived from the model. What information will the auditor require to validate the bank's WCDR estimation?
A
Detailed information about the credit risk grading system used by the bank, including how ratings correlate to calculated PDs.
B
The probability of default, asset correlation, the confidence level, and the methods used to estimate these parameters.
C
Current macroeconomic forecasts and stress testing scenarios that were used to adjust the PDs and correlation parameters under adverse conditions.
D
Statistical validation reports of the model's performance over recent years, including comparisons with actual default occurrences.