Sx
p
n
1
1
–
(
)
Sx
1
2
n
2
1
–
(
)
Sx
2
2
+
df
--------------------------------------------------------------------
=
S
1
n
1
-----
1
n
2
-----
Sx
p
+
=
df
n
1
n
2
2
–
+
=
i
e
y
x
1
+
(
)
ln
×
(
)
[
]
1
–
=
i
–
FV PV
÷
(
)
1
N
÷
(
)
1
–
=
Appendix B: Reference Information
387
otherwise:
and
Sxp
is the pooled variance.
Financial Formulas
This section contains financial formulas for computing time value of money, amortization, cash
flow, interest-rate conversions, and days between dates.
Time Value of Money
where:
PMT
=
0
where
:
PMT
y
x
C/Y
P/Y
I%
ƒ
=
=
=
=
=
0
C/Y
÷
P/Y
(.
01
×
I%
)
÷
C/Y
compounding periods per year
payment periods per year
interest rate per year
