HP 12c Solutions Handbook page 93

4
0
2
3
6
The procedure is repeated for several 's.
Smoothing Constant ( )
Cumulative Error ( e
For the selected
Forecasting:
Keystrokes
CLEAR
1
.25 0
1
24.28 2
.34 3
25.64 6
26
5
0
2
3
6
Note: At least 4 periods of current data should be entered before
forecasting is attempted.
23.61
Cumulative error ( e
0.50 Smoothing constant (a).
Smoothing average (S
25.11
Trend (T
0.42
Last forecast (D
25.95
.5
2
) 23.61 25.14 17.01 18.03
= .25 S = 24.28
t+1
T = 0.34
t-1
D = 25.64
t+1
Display
0.00
1.00
0.75
0.75
24.28
0.34
25.64
0.36
26.16
Forecast for month 9, (
Expected usage for current (month
25.80
8) period, (Smoothed D
0.25
24.71
Record for initial values when
0.36 month 9 actual figures become
available.
26.16
92
).
t-1
).
t+1
.1 .25 .2
2
).
).
t-1
).
t+1
).
t