The U.S. Department of Commerce publishes a series of census documents referred to as Current Industrial Reports. Included in these documents are the manufacturers’ shipments, inventories, and orders over a 5-year period. Displayed here is a portion of these data representing the shipments of chemicals and allied products from January of year 1 through December of year 5. Use time-series decomposition methods to develop the seasonal indexes for these data.
Chemicals
and Allied
Products
Time Period
($ billion)
January (year 1)
23.701
January (year 2)
23.347
February
24.189
24.122
March
24.200
25.282
April
24.971
25.426
May
24.560
25.185
June
24.992
26.486
July
22.566
24.088
August
24.037
24.672
September
25.047
26.072
October
24.115
24.328
November
23.034
23.826
December
22.590
24.373
January (year 3)
24.207
January (year 4)
25.316
25.772
26.435
27.591
29.346
26.958
28.983
25.920
28.424
28.460
30.149
24.821
26.746
25.560
28.966
27.218
30.783
25.650
28.594
25.589
28.762
25.370
29.018
January (year 5)
28.931
30.456
32.372
30.905
30.743
32.794
29.342
30.765
31.637
30.206
30.842
31.090
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