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Let's assume that the collateral rate on cash equals the overnight rate, that we have a schematic (lined/tiled up accrual periods and payments dates) strip of dates/times $T_0<T_1<\ldots <T_n$, accrual factor $\tau_t := \tau(t-1,t)$, and $c_t$ collateral rate at $t$ (overnight $t-1$ to $t$). The floating coupon is then:  \prod_{s=T_{i-1}}^{T_i}\...