Related provisions for IFPRU 4.6.4

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BIPRU 4.3.89GRP
Estimation of PD through the use of a technique set out in BIPRU does not remove the need to make conservative adjustments, where necessary, related to the expected range of estimation errors so that capital requirements produced by the relevant model or other rating system are not understated.
IFPRU 4.6.1GRP
'Rating philosophy' describes the point at which a rating system sits on the spectrum between the stylised extremes of a point in time (PiT) rating system and a through-the-cycle (TTC) rating system. To explain these concepts:(1) PiT: a firm seeks to explicitly estimate default risk over a fixed period, typically one year. Under such an approach, the increase in default risk in a downturn results in a general tendency for migration to lower grades. When combined with the fixed
BIPRU 4.2.26RRP
(1) To the extent that its IRB permission permits this, a firm permitted to use the IRB approach in the calculation of risk weighted exposure amounts and expected loss amounts3 for one or more IRB exposure classes may apply the standardised approach in accordance with this rule.3(2) A firm may apply the standardised approach to the IRB exposure class referred to in BIPRU 4.3.2 R (1) (Sovereigns) where the number of material counterparties is limited and it would be unduly burdensome