The following values represent a cubic trend pattern mixed with some randomness. Apply a single 3-period moving average, a single 5-period moving average, a single 7-period moving average, a double 3 × 3 moving average, and a double 5 × 5 moving average. Which type of moving average seems most appropriate to you in identifying the cubic pattern of the data?
|
Period
|
Shipments
|
Period
|
Shipments
|
|
1
|
42
|
9
|
180
|
|
2
|
69
|
10
|
204
|
|
3
|
100
|
11
|
228
|
|
4
|
115
|
12
|
247
|
|
5
|
132
|
13
|
291
|
|
6
|
141
|
14
|
337
|
|
7
|
154
|
15
|
391
|
|
8
|
171
|
|
|