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There are quarters of sales data 500,350,250,400 450,350,200,300 350,200,150,400 550,350,250,550 550,400,350,600 750,500,400,650,850 Using Minitab 18.0 Winter's time series forecasting method forecast 3 quarters...

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Statistics

There are quarters of sales data

500,350,250,400

450,350,200,300

350,200,150,400

550,350,250,550

550,400,350,600

750,500,400,650,850

Using Minitab 18.0 Winter's time series forecasting methodforecast 3 quarters ahead

The weights are level=.2;trend=.2;seasonal=.2

Answer & Explanation Solved by verified expert
4.0 Ratings (799 Votes)

   
1   500
2   350
3   250
4   400
5   450
6   350
7   200
8   300
9   350
10   200
11   150
12   400
13   550
14   350
15   250
16   550
17   550
18   400
19   350
20   600
21   750
22   500
23   400
24   650
25   850

Winters’ Method for C2

Multiplicative Method


Data    C2
Length 25


Smoothing Constants

α (level)     0.2
γ (trend)     0.2
δ (seasonal) 0.2


Accuracy Measures

MAPE     19.0
MAD      76.7
MSD   10429.7


Forecasts

Period Forecast    Lower    Upper
26       572.846 385.011   760.68
27       436.613 245.835   627.39
28       818.166 624.107 1012.23


Winters’ Method Plot for C2
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