Apple iWork '09 - Manual (Page 118)

 days-basis: An optional argument specifying the number of days per month and
days per year used in the calculations.
30/360 (0 or omitted): 30 days in a month, 360 days in a year, using the NASD
method for dates falling on the 31st of a month.
actual/actual (1): Actual days in each month, actual days in each year.
actual/360 (2): Actual days in each month, 360 days in a year.
actual/365 (3): Actual days in each month, 365 days in a year.
30E/360 (4): 30 days in a month, 360 days in a year, using the European method for
dates falling on the 31st of a month (European 30/360).
Example
In this example, the DISC function is used to determine the annual discount rate of the hypothetical
security described by the values listed.
The function evaluates to 5.25%, the annual discount rate.
settle maturity price redemption days-basis
=DISC(B2, C2, D2,
E2, F2) 05/01/2009 06/30/2015 67.64 100 0
Related Topics
For related functions and additional information, see:
“PRICEDISC” on page 138
“YIELDDISC” on page 152
“Common Arguments Used in Financial Functions” on page 341
“Listing of Financial Functions” on page 96
“Value Types” on page 36
“The Elements of Formulas” on page 15
“Using the Keyboard and Mouse to Create and Edit Formulas” on page 26
“Pasting from Examples in Help” on page 41
118 Chapter 6 Financial Functions