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The term Advanced IRB or A-IRB is an abbreviation of advanced internal ratings-based approach, and it refers to a set of credit risk measurement techniques proposed under Basel II capital adequacy rules for banking institutions. Under this approach the banks are allowed to develop their own empirical model to quantify required capital for ...
This is known as the internal ratings-based (IRB) approach to capital requirements for credit risk. Only banks meeting certain minimum conditions, disclosure requirements and approval from their national supervisor are allowed to use this approach in estimating capital for various exposures.
Advanced measurement approach (AMA) is one of three possible operational risk methods that can be used under Basel II by a bank or other financial institution. The other two are the Basic Indicator Approach and the Standardised Approach .
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IRB stands for "Internal Rating-Based Approach". For operational risk, there are three different approaches – basic indicator approach or BIA, standardized approach or TSA, and the internal measurement approach (an advanced form of which is the advanced measurement approach or AMA). For market risk the preferred approach is VaR (value at risk).
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There are some options in weighing risks for some claims, below are the summary as it might be likely to be implemented. NOTE: For some "unrated" risk weights, banks are encouraged to use their own internal-ratings system based on Foundation IRB and Advanced IRB in Internal-Ratings Based approach with a set of formulae provided by the Basel-II accord.
The most sophisticated approaches, Advanced IRB approach and AMA or advanced measurement approach for operational risk were available from January 2008. From this date, all concerned EU firms had to comply with Basel II .