For each bucket, the factors , and and looked up based on cases cty, tenor, basis - represented by the levels in the hierarchy Commodity Delta Double Sums.
Commodity delta risk position correlations
The Commodity Delta Risk Position Correlations in FRTBCombinedCube, the intra-bucket correlation parameter (rho_kl) between delta sensitivities per Basel MAR21.83, requires Commodity Delta Double Sums and Commodity Buckets hierarchies
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