# Documentation/Calc Functions/DURATION Under construction. For now, see the system Help files.

DURATION

## Category:

Financial Analysis

## Summary:

Calculates the duration of a fixed interest security in years.

## Syntax:

DURATION(Settlement; Maturity; Coupon; Yield; Frequency; Basis)

## Arguments:

Settlement is the date of purchase of the security.

Maturity is the date on which the security matures (expires).

Coupon is the annual coupon interest rate (nominal rate of interest)

Yield is the annual yield of the security.

Frequency is the number of interest payments per year (1, 2 or 4).

Basis (optional) is chosen from a list of options and indicates how the year is to be calculated.

Basis Calculation
0 or missing US method (NASD), 12 months of 30 days each
1 Exact number of days in months, exact number of days in year
2 Exact number of days in month, year has 360 days
3 Exact number of days in month, year has 365 days
4 European method, 12 months of 30 days each

The functions whose names end with _ADD or _EXCEL2003 return the same results as the corresponding Microsoft Excel 2003 functions without the suffix. Use the functions without suffix to get results based on international standards.

## Examples:

A security is purchased on 2001-01-01; the maturity date is 2006-01-01. The Coupon rate of interest is 8%. The yield is 9.0%. Interest is paid half-yearly (frequency is 2). Using daily balance interest calculation (basis 3) how long is the duration?

=DURATION("2001-01-01";"2006-01-01";0.08;0.09;2;3)