債券デュレーション

Duration measures a bond's sensitivity to changes in interest rates based on the timing of cash flows. It specifies the unit of analysis and the assumptions behind rate sensitivity, including yield curve shifts and cash-flow timing. The concept separates what is in scope (coupon timing and maturity) from what is out of scope (credit risk changes), so comparisons stay consistent. Applied well, it turns a vague debate into a measurable choice and makes the drivers of results explicit.

Bond Duration should be calculated with a stable numerator, denominator, and time window. Formula | Bond Duration = Weighted average present-value timing of bond cash flows | Use it to estimate bond price sensitivity to interest-rate changes. Time window | Use the same period for every comparison | Prevents artificial movement Segment | Calculate by plan, market, cohort, or owner when useful | Reveals where the change came from

The boundary of Bond Duration must be written before it is used as a KPI. Include | Recurring and comparable inputs that match the definition | Keeps trend analysis reliable Exclude | One-off, unmatched, or non-comparable items | Avoids inflated or misleading movement Document | Data source, owner, refresh timing, and exception rules | Makes reviews reproducible

Bond Duration changes because the underlying operating drivers change. Volume | More or fewer units, users, customers, or transactions | Explains scale effects Mix | Change in segment, plan, product, or channel composition | Explains quality of growth or decline Efficiency | Better conversion, retention, cost control, or process discipline | Explains operating improvement

Use Bond Duration to decide portfolio interest rate exposure, because it exposes price sensitivity and the trade-off with yield versus volatility. It changes budgeting and prioritization by making yield curve shifts and cash-flow timing explicit and reviewable. It informs adjustments when rate expectations change, so the decision stays grounded in current conditions.

• Use Bond Duration to decide portfolio interest rate exposure, because it exposes price sensitivity and the trade-off with yield versus volatility.
• It changes budgeting and prioritization by making yield curve shifts and cash-flow timing explicit and reviewable.
• It informs adjustments when rate expectations change, so the decision stays grounded in current conditions.

• Define the unit and time horizon before comparing duration across options.
• Track the primary driver (duration in years) separately from secondary noise.
• Run sensitivity checks on yield changes and convexity to avoid false precision.
• Document data sources and calculation steps so results are auditable.
• Revisit duration targets when the business model or market context changes.

Do not read Bond Duration alone. Compare with companion metrics before changing budget or targets. Check whether the movement came from real performance or definition drift. Avoid optimizing the metric in a way that harms customer quality or long-term value.

• Compare with companion metrics before changing budget or targets.
• Check whether the movement came from real performance or definition drift.
• Avoid optimizing the metric in a way that harms customer quality or long-term value.

Read Bond Duration together with metrics that explain quality, scale, and risk. Growth metric | Shows direction | Explains whether the trend is improving Efficiency metric | Shows cost or effort | Explains whether the result is economical Risk metric | Shows volatility or concentration | Explains whether the result is durable

A pension fund expects rate hikes and shortens portfolio duration from seven to three years. It models price sensitivity under parallel rate shifts and checks yield impact. The analysis shows acceptable income with lower volatility, so the shift is executed. After implementation, the fund monitors duration as the curve changes.

Compare Bond Duration with adjacent concepts before deciding. Bond Duration | Current concept | Use when the team needs the primary decision lens Adjacent metric or framework | Supporting lens | Use when the team needs evidence or process detail General vocabulary | Broad explanation | Use only for orientation, not final decision-making

• Duration is not the same as maturity; coupons affect sensitivity.
• Higher yield does not always compensate for higher duration risk.
• Duration does not capture credit risk or liquidity risk.