Weighted-average life
http://dbpedia.org/resource/Weighted-average_life
加权平均期限（英語：weighted-average life，缩写WAL），或称为平均期限（average life），在金融学中是指用一个分期偿还贷款或分期偿还债券的各期本金偿还额为权重，得到的各期偿还额的加权平均期限。 加权平均期限可以按以下公式计算： 其中
* 为本金，
* 为第期的本金偿还额，
* 为第期的偿还期限（以年为单位）。 如需按月计算，可表示为 ，其中为结算日期与第一个现金流日期之间的时间占一个月的比例。 与加权平均期限相关的一个概念为债券久期。债券久期同样为一个加权平均时间，但并非以本金偿还额（不含利息）为权重，而是以各期现金流（包括本金与利息）的现值为权重。
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In finance, the weighted-average life (WAL) of an amortizing loan or amortizing bond, also called average life, is the weighted average of the times of the principal repayments: it's the average time until a dollar of principal is repaid. In a formula, where:
* is the (total) principal,
* is the principal repayment that is included in payment , hence
* is the fraction of the total principal that is included in payment , and
* is the time (in years) from the calculation date to payment .
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Weighted-average life
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加权平均期限
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15646748
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924692495
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In finance, the weighted-average life (WAL) of an amortizing loan or amortizing bond, also called average life, is the weighted average of the times of the principal repayments: it's the average time until a dollar of principal is repaid. In a formula, where:
* is the (total) principal,
* is the principal repayment that is included in payment , hence
* is the fraction of the total principal that is included in payment , and
* is the time (in years) from the calculation date to payment . If desired, can be expanded as for a monthly bond, where is the fraction of a month between settlement date and first cash flow date.
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加权平均期限（英語：weighted-average life，缩写WAL），或称为平均期限（average life），在金融学中是指用一个分期偿还贷款或分期偿还债券的各期本金偿还额为权重，得到的各期偿还额的加权平均期限。 加权平均期限可以按以下公式计算： 其中
* 为本金，
* 为第期的本金偿还额，
* 为第期的偿还期限（以年为单位）。 如需按月计算，可表示为 ，其中为结算日期与第一个现金流日期之间的时间占一个月的比例。 与加权平均期限相关的一个概念为债券久期。债券久期同样为一个加权平均时间，但并非以本金偿还额（不含利息）为权重，而是以各期现金流（包括本金与利息）的现值为权重。
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9221