274
APPENDIX
(2) Error conditions during financial calculations
• r
≤
-1
• N = 0 in PMT calculations
• I% = 0 and PMT = 0, or I%
≠
0 and FV = (1/r) (1 + r
×
s)
×
PMT, in N
calculations.
s = 1 (Pmt_Begin)
s = 0 (Pmt_End)
In I% calculations
If PMT > 0:
Pmt_End mode:
PV
≥
0 and FV + PMT
≥
0
PV < 0 and FV + PMT < 0
Pmt_Begin mode: PV + PMT
≥
0 and FV
≥
0
PV + PMT < 0 and FV < 0
If PMT < 0:
Pmt_End mode:
PV > 0 and FV + PMT > 0
PV
≤
0 and FV + PMT
≤
0
Pmt_Begin mode: PV + PMT > 0 and FV > 0
PV + PMT
≤
0 and FV
≤
0
If PMT = 0: PV
÷
FV
≥
0
• FV, N
×
PMT, PV
≥
0 or FV, N
×
PMT, PV
≤
0
• Irr calculation: All cash flows have the same sign.
(3) Distribution function
1
pdfnorm(
f (x) =
exp (–
)
1
√
2
π σ
(x–
µ
)
2
2
σ
2
Calculation result
→
Xreg
µ
: Mean
σ
: Standard
deviation
2
pdfT(
f (x) =
Γ
(
) (1+
)
df+1
2
x
2
df
–
Γ
(
)
df
2
√
π
df
However:
Γ
(s) =
∫
x
s–1
e
–x
dx
∞
0
Calculation result
→
Xreg
df+1
2
EL-9650-Appendix (265-281)
8/3/00, 5:06 PM
274
Summary of Contents for EL-9650
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