102
Tabel 5.13 Tabel Peramalan Data Penjualan Dust Collector 20m³
dengan Metode Double Exponensial Smoothing Satu Parameter Brown
a
=
0.2
x
=
53.94
t
data (xt)
s't
s"t
at
bt
m
ft
et
¦et¦
pet
¦pet¦
1
33
33.00
33.00
2
38
34.00
33.20
34.80
0.20
3
35
34.20
33.40
35.00
0.20
1
35.00
0.00
0.00
0.00
0.00
4
46
36.56
34.03
39.09
0.63
1
35.20
10.80
10.80
23.48
23.48
5
34
36.05
34.44
37.66
0.40
1
39.72
-5.72
5.72
-16.82
16.82
6
39
36.64
34.88
38.40
0.44
1
38.06
0.94
0.94
2.40
2.40
7
55
40.31
35.96
44.66
1.09
1
38.84
16.16
16.16
29.38
29.38
8
45
41.25
37.02
45.48
1.06
1
45.75
-0.75
0.75
-1.66
1.66
9
37
40.40
37.70
43.10
0.68
1
46.53
-9.53
9.53
-25.77
25.77
10
48
41.92
38.54
45.30
0.84
1
43.78
4.22
4.22
8.80
8.80
11
46
42.74
39.38
46.09
0.84
1
46.14
-0.14
0.14
-0.31
0.31
12
52
44.59
40.42
48.76
1.04
1
46.93
5.07
5.07
9.75
9.75
13
55
46.67
41.67
51.67
1.25
1
49.80
5.20
5.20
9.46
9.46
14
58
48.94
43.12
54.75
1.45
1
52.92
5.08
5.08
8.76
8.76
15
63
51.75
44.85
58.65
1.73
1
56.20
6.80
6.80
10.79
10.79
16
56
52.60
46.40
58.80
1.55
1
60.37
-4.37
4.37
-7.81
7.81
17
44
50.88
47.30
54.46
0.90
1
60.35
-16.35
16.35
-37.16
37.16
18
47
50.10
47.86
52.35
0.56
1
55.36
-8.36
8.36
-17.79
17.79
19
56
51.28
48.54
54.02
0.69
1
52.91
3.09
3.09
5.51
5.51
20
50
51.03
49.04
53.01
0.50
1
54.71
-4.71
4.71
-9.42
9.42
21
72
55.22
50.28
60.17
1.24
1
53.51
18.49
18.49
25.68
25.68
22
61
56.38
51.50
61.26
1.22
1
61.40
-0.40
0.40
-0.66
0.66
23
52
55.50
52.30
58.71
0.80
1
62.48
-10.48
10.48
-20.15
20.15
24
56
55.60
52.96
58.24
0.66
1
59.51
-3.51
3.51
-6.26
6.26
25
68
58.08
53.98
62.18
1.02
1
58.91
9.09
9.09
13.37
13.37
26
64
59.26
55.04
63.49
1.06
1
63.20
0.80
0.80
1.24
1.24
27
74
62.21
56.47
67.95
1.43
1
64.55
9.45
9.45
12.77
12.77
28
61
61.97
57.57
66.37
1.10
1
69.38
-8.38
8.38
-13.75
13.75
29
55
60.58
58.17
62.98
0.60
1
67.47
-12.47
12.47
-22.66
22.66
30
57
59.86
58.51
61.21
0.34
1
63.58
-6.58
6.58
-11.54
11.54
31
77
63.29
59.47
67.11
0.96
1
61.55
15.45
15.45
20.07
20.07
32
80
66.63
60.90
72.36
1.43
1
68.07
11.93
11.93
14.92
14.92
33
66
66.50
62.02
70.99
1.12
1
73.80
-7.80
7.80
-11.81
11.81
34
1
72.11
35
2
73.23
36
3
74.35
TOTAL
23.03
222.12
-7.18
399.95
MAPE =
12.90
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