Related provisions for BIPRU 4.3.27

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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]
If a firm uses data that is pooled across institutions it must be able to demonstrate to the appropriate regulator that:(1) the rating systems and criteria of other firms in the pool are similar to its own;(2) the pool is representative of the portfolio for which the pooled data is used; and(3) the pooled data is used consistently over time by the firm for its permanent estimates.2[Note:BCD Annex VII Part 4 point 57]