Related provisions for BIPRU 5.6.21
Table: Formulae for the calculation of risk weighted exposure amounts
This table belongs to BIPRU 4.4.57 R
Correlation (R) 
0.12 × (1  EXP(50*PD))/(1EXP(50)) + 0.24* 

[1(1EXP(50*PD))/(1EXP(50))] 

Maturity factor (b) 
(0.118520.05478*1n(PD))^{2} 

(LGD*N[(1R)^{0.5}*G(PD)+(R/(1R))^{0.5} *G(0.999)]PD*LGD)* 

(11.5*b)^{1}*(1+(M2.5)*b)*12.5*1.06 

N(x) 
denotes the cumulative distribution function for a standard normal random variable (i.e. the probability that a normal random variable with mean zero and variance of one is less than or equal to x). G(z) denotes the inverse cumulative distribution function for a standard normal random variable (i.e. the value x such that N(x) = z). 

PD = 0 
For PD = 0, RW shall be: 0 

PD = 1 
For PD = 1: 

(i) 
for defaultedexposures where a firm applies the LGD values set out in BIPRU 4.4.32R and BIPRU 4.8.25R RW shall be: 0; 

(ii) 
for defaultedexposures where a firm uses its own estimates of LGDs, RW shall be: Max {0, 12.5 *(LGDEL_{BE})}; 

where EL_{BE}must be the firm's best estimate of expected loss for the defaultedexposure according to BIPRU 4.3.122 R. 
[Note:BCD Annex VII Part 1 point 3]