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Related provisions for BIPRU 4.3.92
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A firm must also use other appropriate quantitative validation tools and comparisons with relevant external data sources. The analysis must be based on data that is appropriate to the portfolio, is updated regularly, and covers a relevant observation period. A firm's internal assessments of the performance of its rating systems must be based on as long a period as possible.[Note:BCD Annex VII Part 4 point 112]