Duration Real

Function Duration Real within Inflation Bondreturns the real duration(s) of the referenced inflation bond(s) as of a given reference date T.
The real duration is defined in the same way as the regular Duration, albeit with respect to the real economy associated with a given real yield yʳas defined in Yield Real
The exact duration definition must be supplied as an element of the list Duration Type
Since all duration definitions involve ratios of dirty bond prices, it turns out that the inflation index drops out and the real duration equals the regular duration of the corresponding inflation-unadjusted bond defined in Underl Bond

If the settlement date Tˢ is not explicitly given, it will be set to the bond's settlement date as implied by a trade transaction assumed to occur on the trade dateT₀ (typically today).