where [I.sup.s.sub.s] is the value of arithmetic rate of index L in period t and under scenario s, [[micro].sub.I,t] is the average value of the arithmetic rate of index I in period t, [[lambda].sub.s] is the parameter generating scenario s, [[sigma].sup.1] is the typical deviation of arithmetic rate of index I, RPI is the arithmetic rate of annual variation in retail prices, GDP is the arithmetic rate of annual variation in gross domestic product, AEI is the arithmetic rate of annual variation in average earnings, and TSSCI is the arithmetic rate of annual variation in total Social Security contributions.
TABLE 6 Formulae for Calculating the Initial Pension and Its Later Variation Notional Revaluation of the Rate for Model (9) Contribution Base Contributions 1 RPI GDP 2 RPI GDP 3 RPI TSSCI 11 AEI GDP 12 AEI GDP 13 AEI TSSCI Model (9) Notional Rate for Pensions 1 RPI 2 RPI [+ or -] AEI differential 3 RPI [+ or -] TSSCI differential 11 RPI 12 RPI [+ or -] AEI differential 13 RPI [+ or -] TSSCI differential TABLE 7 Average Expected RR Average expected RR Model Group 46.43% 11-12 1 46.39% 1-2 2 41.27% 13 3 41.24% 3 4 Retirement age 65.