HP 12c Platinum Reference Manual page 91

12c platinum / 12C
RPN Keystrokes
:2
:3
:6
The procedure is repeated for several
Smoothing Constant (α)
Cumulative Error (Σe
For the selected α = .25
Forecasting:
12c platinum / 12C
RPN Keystrokes
fCLEARH
1\
.25?0-
?1
24.28?2
.34?3
25.64?6
26t
t
:5
:0
:2
:3
:6
At least 4 periods of current data should be entered before forecasting is attempted.
Note:
12c platinum
ALG Keystrokes
:2
:3
:6
α
's.
.5 .1
2
) 23.61 25.14
S = 24.28
t+1
T = 0.34
t-1
25.64
D ˆ
=
t+1
12c platinum
ALG Keystrokes
fCLEARH
1-
.25?0³
?1
24.28?2
.34?3
25.64?6
26t
t
:5
:0
:2
:3
:6
Display
Smoothing average (S
25.11
Trend (T
0.42
Last forecast
25.95
.25 .2
17.01 18.03
Display
0.00
1.00
0.75
0.75
24.28
0.34
25.64
0.36
Forecast for month 9, ( D ˆ
26.16
Expected usage for current
25.80
(month 8) period, (Smoothed
D ).
t
α
0.25
Record for initial values when
24.71
month 9 actual figures become
0.36
available.
26.16
Forecasting
Comments
).
t-1
).
t-1
D ˆ
( ).
t+1
Comments
t+1
91
).