OFLMDURATION

Updated 2024-02-28 16:36:55.393000

Syntax

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

Description

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

MDURATION=\frac{-\frac{\partial{P}}{\partial{y}}}{p_{dirty}}

Arguments

@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.

@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.

@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.

@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.

@Basis

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

{"columns":[{"field":"@Basis","width":313},{"field":"Day count basis","width":277}],"rows":[{"@Basis":"0 , 'BOND'","Day count basis":"US (NASD) 30/360"},{"@Basis":"1 , 'ACTUAL'","Day count basis":"Actual/Actual"},{"@Basis":"2 , 'A360'","Day count basis":"Actual/360"},{"@Basis":"3 , 'A365'","Day count basis":"Actual/365"},{"@Basis":"4 , '30E/360 (ISDA)' , '30E/360' , 'ISDA' , '30E/360 ISDA' , 'EBOND'","Day count basis":"European 30/360"},{"@Basis":"5 , '30/360' , '30/360 ISDA' , 'GERMAN'","Day count basis":"30/360 ISDA"},{"@Basis":"6 , 'NL/ACT'","Day count basis":"No Leap Year/ACT"},{"@Basis":"7 , 'NL/365'","Day count basis":"No Leap Year /365"},{"@Basis":"8 , 'NL/360'","Day count basis":"No Leap Year /360"},{"@Basis":"9 , 'A/364'","Day count basis":"Actual/364"},{"@Basis":"10 , 'BOND NON-EOM'","Day count basis":"US (NASD) 30/360 non-end-of-month"},{"@Basis":"11 , 'ACTUAL NON-EOM'","Day count basis":"Actual/Actual non-end-of-month"},{"@Basis":"12 , 'A360 NON-EOM'","Day count basis":"Actual/360 non-end-of-month"},{"@Basis":"13 , 'A365 NON-EOM'","Day count basis":"Actual/365 non-end-of-month"},{"@Basis":"14 , '30E/360 NON-EOM' , '30E/360 ICMA NON-EOM' , 'EBOND NON-EOM'","Day count basis":"European 30/360 non-end-of-month"},{"@Basis":"15 , '30/360 NON-EOM' , '30/360 ISDA NON-EOM' , 'GERMAN NON-EOM'","Day count basis":"30/360 ISDA non-end-of-month"},{"@Basis":"16 , 'NL/ACT NON-EOM'","Day count basis":"No Leap Year/ACT non-end-of-month"},{"@Basis":"17 , 'NL/365 NON-EOM'","Day count basis":"No Leap Year/365 non-end-of-month"},{"@Basis":"18 , 'NL/360 NON-EOM'","Day count basis":"No Leap Year/360 non-end-of-month"},{"@Basis":"19 , 'A/364 NON-EOM'","Day count basis":"Actual/364 non-end-of-month"}]}

@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.

@IssueDate

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

@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.

@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.

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 OFLMDURATION returns an error.

If @Basis is invalid (see above list), OFLMDURATION 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 @IssueDate is NULL then an error is returned.