In trading, the basis is the relative difference between the price of the future contract and the spot price.
This quantity is usually presented as an absolute price difference, but in its relative form can be annualised by dividing by the time to expiry τ of the contract expressed in years:
Let us consider a hypothetical contract starting today with a given tenor of 1 month (1M) or 3 months ( 3M ). Such a contract does not necessarily trade in the market and thus has no observable price to calculate the basis. The rolling basis is the basis between this ’bespoke’ contract and the spot.
This quantity is inferred from existing contracts’ basis and the calculation is accomplished in two steps:
1. Forward yield
First, we select two contracts with expiries T1 and T2 surrounding the hypothetical contract’s expiry Ttarget (T1 ≤ Ttarget ≤ T2). The forward yield is calculated as:
- Ti: time to maturity for contract i
- BASISi: annualised basis for contract i
2. Weighted Basis Average
The rolling basis is calculated as a weighted average between the first contract’s basis and the forward yield:
The description of the indicator was copied from another source, but fully corresponds to this indicator.
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