SQL Server OFLDURATION Function

Updated 2024-02-28 16:35:13.013000

Description

Use the scalar function OFLDURATION to calculate the duration for a bond that has an odd first and an odd last coupon. The duration is calculated as the first derivative of the price of the bond with respect to yield multiplied by -1, divided by the dirty price of the bond multiplied by 1 plus the yield divided by the frequency.

DURATION=\frac{-\frac{\partial{P}}{\partial{y}}}{p_{dirty}}\left(1+\frac{Y}{F}\right)

Syntax

SELECT [westclintech].[wct].[OFLDURATION](
  <@Settlement, datetime,>
 ,<@Maturity, datetime,>
 ,<@IssueDate, datetime,>
 ,<@FirstCouponDate, datetime,>
 ,<@LastCouponDate, datetime,>
 ,<@Rate, float,>
 ,<@Yld, float,>
 ,<@Redemption, float,>
 ,<@Frequency, float,>
 ,<@Basis, nvarchar(4000),>)

Arguments

@Settlement

the settlement date of the bond. @Settlement is an expression that returns a datetime or smalldatetime value, or a character string in date format.

@Maturity

the maturity date of the bond. @Maturity is an expression that returns a datetime or smalldatetime value, or a character string in date format.

@IssueDate

the issue date of the bond; the date from which the bond starts accruing interest. @Issue is an expression that returns a datetime or smalldatetime value, or a character string in date format.

@FirstCouponDate

the first coupon date of the bond. The period from the issue date until the first coupon date defines the odd interest period. All subsequent coupon dates are assumed to occur at regular periodic intervals as defined by @Frequency. @FirstCouponDate is an expression that returns a datetime or smalldatetime value, or a character string in date format.

@LastCouponDate

the last coupon date of the bond prior to the maturity. The period from the last interest date until the maturity date defines the odd interest period. All coupon dates from @FirstCouponDate to @LastCouponDate are assumed to occur at regular periodic intervals as defined by @Frequency. @LastCouponDate is an expression that returns a datetime or smalldatetime value, or a character string in date format.

@Rate

the bond's annual coupon rate. @Rate is an expression of type float or of a type that can be implicitly converted to float.

@Yld

the yield for the maturity date passed into the function. @Yld is an expression of type float or of a type that can be implicitly converted to float.

@Redemption

the redemption value of the bond assuming a par value of 100. @Redemption is an expression of type float or of a type that can be implicitly converted to float.

@Frequency

the number of coupon payments per year. For annual payments, @Frequency = 1; for semi-annual, @Frequency = 2; for quarterly, @Frequency = 4; for bimonthly @Frequency = 6; for monthly @Frequency = 12. For bonds with @Basis = 'A/364' or 9, you can enter 364 for payments made every 52 weeks, 182 for payments made every 26 weeks, 91 for payments made every 13 weeks, 28 for payments made every 4 weeks, 14 for payments made every 2 weeks, and 7 for weekly payments. @Frequency is an expression of type float or of a type that can be implicitly converted to float.

@Basis

is the type of day count to use. @Basis is an expression of the character string data type category.

@Basis	Day count basis
0 , 'BOND'	US (NASD) 30/360
1 , 'ACTUAL'	Actual/Actual
2 , 'A360'	Actual/360
3 , 'A365'	Actual/365
4 , '30E/360 (ISDA)' , '30E/360' , 'ISDA' , '30E/360 ISDA' , 'EBOND'	European 30/360
5 , '30/360' , '30/360 ISDA' , 'GERMAN'	30/360 ISDA
6 , 'NL/ACT'	No Leap Year/ACT
7 , 'NL/365'	No Leap Year /365
8 , 'NL/360'	No Leap Year /360
9 , 'A/364'	Actual/364
10 , 'BOND NON-EOM'	US (NASD) 30/360 non-end-of-month
11 , 'ACTUAL NON-EOM'	Actual/Actual non-end-of-month
12 , 'A360 NON-EOM'	Actual/360 non-end-of-month
13 , 'A365 NON-EOM'	Actual/365 non-end-of-month
14 , '30E/360 NON-EOM' , '30E/360 ICMA NON-EOM' , 'EBOND NON-EOM'	European 30/360 non-end-of-month
15 , '30/360 NON-EOM' , '30/360 ISDA NON-EOM' , 'GERMAN NON-EOM'	30/360 ISDA non-end-of-month
16 , 'NL/ACT NON-EOM'	No Leap Year/ACT non-end-of-month
17 , 'NL/365 NON-EOM'	No Leap Year/365 non-end-of-month
18 , 'NL/360 NON-EOM'	No Leap Year/360 non-end-of-month
19 , 'A/364 NON-EOM'	Actual/364 non-end-of-month

Return Type

float

Remarks

If @Settlement is NULL then @Settlement = GETDATE().

If @Rate is NULL then @Rate = 0.

If @Yield is NULL then @Yield = 0.

If @Redemption is NULL then @Redemption = 100.

If @Frequency is NULL then @Frequency = 2.

If @Basis is NULL then @Basis = 0.

If @Frequency is any number other than 1, 2, 4, 6 or 12, or for @Basis = 'A/364' any number other than 1, 2, 4, 6 or 12 as well as 7, 14, 28, 91, 182 or 364 OFLDURATION returns an error.

If @Basis is invalid (see above list), OFLDURATION returns an error.

If @Maturity is NULL then an error is returned.

If @LastCouponDate is NULL then an error is returned.

If @FirstCouponDate is NULL then an error is returned.

If @Issue is NULL then an error is returned.

If @Settlement >= @FirstCouponDate then the price is calculated using ODDLPRICE.