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The formula is: I n general, six things affect a bond's duration: Bond's Price: The higher a bond's coupon, the more income it produces early on and thus the shorter its duration. The lower the coupon, the longer the duration and volatility.
Zero-coupon bonds , which have only one cash flow , have durations equal to their maturities. The longer a bond's maturity, the greater its duration and volatility. Duration changes every time a bond makes a coupon payment. Over time, it shortens as the bond nears maturity.
Yield to Maturity: The higher a bond's yield to maturity, the shorter its duration because the present value of the distant cash flows which have the heaviest weighting become overshadowed by the value of the nearer payments. Sinking Fund: The presence of a sinking fund, which is a scheduled prepayment of the bond before it matures, lowers a bond's duration because the extra cash flows in the early years are greater than those of a bond without a sinking fund. Call Provision: Bonds with call provisions also have shorter durations because the principal is repaid earlier than a similar non-callable bond.
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A principle of mortgage analysis is that the higher a mortgage-backed security's coupon is relative to the current coupon, the more likely that mortgage-backed security is to prepay. I n general, six things affect a bond's duration: Not a customer? The formula is:. A Primer on Inflation-Linked Bonds. Plot the duration of your fixed income holdings using Fidelity's Guided Portfolio Summary SM GPS to see at a glance the weighted average duration of your fixed income holdings at Fidelity. First Name.
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The ABC's of Stocks. A Primer on Inflation-Linked Bonds. A vanilla bond does not need scenarios--it's cash flows don't change with interest rates--like a bond with embedded option needs scenarios. Hi David: I was wondering about this myself. I am going out on a limb here because I am not an expert. So please feel free to correct me.
I think ktm maybe referring to current coupon rate CCR in the context of fair loan condition Tuckman, pages , One similarity is they both involve finding a yield after removing the embedded-option value. As you summarize above, OAS is a constant spread added to the spot yield curve to equate model price to market price.
In computing CCR, on the other hand, we leave the yield curve intact but adjust the cashflow stream by adjusting the mortgage rate. The mortgage rate that satisfies this condition in the current interest rate environment is called the current coupon rate. The adjustment to PV CF is accomplished by leaving the current yield curve intact but changing the mortgage rate, thus changing the CF stream.
Over time, as the mortgage seasons, the yield curve evolves, and so must the current coupon rate. This is in contrast to the existing mortgage rate, which is fixed since origination or since the most recent re-financing negotiation.
A current coupon refers to a security that is trading closest to its par value without going over par. A bond has a current coupon status if its coupon is set approximately equal to the bonds' yield to maturity (YTM) at the time of issuance. The current coupon is mostly used to. Despite long maturites, prepayments make the duration and spread . the “ current” or par-coupon pass-through mortgage yield as our rate.
The difference between the two rates is one of the factors driving the incentive function in the prepayment model page You must log in or register to reply here. Why Take the Exam? Stay connected We'll keep you informed on new forum posts, relevant blog articles, and everything you'll need to prepare for your exam.