HP 12C#ABA hp 12c_solutions handbook_English_E.pdf - Page 93
The procedure is repeated for several, At least 4 periods of current data should be entered before
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4 23.61 Cumulative error (Σe2). 0 0.50 Smoothing constant (a). 2 25.11 Smoothing average (St-1). 3 0.42 Trend (Tt-1). 6 25.95 Last forecast (Dt+1). The procedure is repeated for several α's. Smoothing Constant (α) .5 .1 .25 .2 Cumulative Error (Σe2) 23.61 25.14 17.01 18.03 For the selected α = .25 St+1= 24.28 Tt-1 = 0.34 Dt+1= 25.64 Forecasting: Keystrokes CLEAR 1 .25 0 1 24.28 2 .34 3 25.64 6 26 5 0 2 3 6 Display 0.00 1.00 0.75 0.75 24.28 0.34 25.64 0.36 26.16 25.80 0.25 24.71 0.36 26.16 Forecast for month 9, ( t+1). Expected usage for current (month 8) period, (Smoothed Dt). α Record for initial values when month 9 actual figures become available. Note: At least 4 periods of current data should be entered before forecasting is attempted. 92