久期 Duration 种测量债券有效期限的方法 A measure of the effective maturity of a bond 每次利息或本金的支付时间的加权平均,权重应与 每次支付的现值相联系 The weighted average of the times until each payment is received, with the weights proportional to the present value of the payment ■除了零息债券,久期短于债券的到期日 Duration is shorter than maturity for all bonds except zero coupon bonds 久期等于零息债券的到期日 Duration is equal to maturity for zero coupon bonds 16-616-6