Producer Price Index Manual: Theory and Practice ... - METAC

22. Treatment of Seasonal Products
Table 22.19. Rolling-Year Approximate Laspeyres, Paasche, and Fisher Price Indices
Year Month P AL (fixed) P AP (fixed) P AF (fixed) P AL (chain) P AP (chain) P AF (chain)
1970 12 1.0000 1.0000 1.0000 1.0000 1.0000 1.0000
1971 1 1.0082 1.0074 1.0078 1.0082 1.0074 1.0078
2 1.0161 1.0146 1.0153 1.0161 1.0146 1.0153
3 1.0257 1.0233 1.0245 1.0257 1.0233 1.0245
4 1.0344 1.0312 1.0328 1.0344 1.0312 1.0328
5 1.0427 1.0390 1.0409 1.0427 1.0390 1.0409
6 1.0516 1.0478 1.0497 1.0516 1.0478 1.0497
7 1.0617 1.0574 1.0596 1.0617 1.0574 1.0596
8 1.0701 1.0656 1.0679 1.0701 1.0656 1.0679
9 1.0750 1.0702 1.0726 1.0750 1.0702 1.0726
10 1.0818 1.0764 1.0791 1.0818 1.0764 1.0791
11 1.0937 1.0881 1.0909 1.0937 1.0881 1.0909
12 1.1008 1.0956 1.0982 1.1008 1.0956 1.0982
1972 1 1.1082 1.1021 1.1051 1.1083 1.1021 1.1052
2 1.1183 1.1110 1.1147 1.1182 1.1112 1.1147
3 1.1287 1.1196 1.1241 1.1281 1.1202 1.1241
4 1.1362 1.1260 1.1310 1.1354 1.1268 1.1311
5 1.1436 1.1326 1.1381 1.1427 1.1336 1.1381
6 1.1530 1.1415 1.1472 1.1520 1.1427 1.1473
7 1.1645 1.1522 1.1583 1.1632 1.1537 1.1584
8 1.1757 1.1620 1.1689 1.1739 1.1642 1.1691
9 1.1812 1.1663 1.1737 1.1791 1.1691 1.1741
10 1.1881 1.1710 1.1795 1.1851 1.1747 1.1799
11 1.1999 1.1807 1.1902 1.1959 1.1855 1.1907
12 1.2091 1.1903 1.1996 1.2051 1.1952 1.2002
1973 1 1.2184 1.1980 1.2082 1.2142 1.2033 1.2087
2 1.2300 1.2074 1.2187 1.2253 1.2133 1.2193
3 1.2425 1.2165 1.2295 1.2367 1.2235 1.2301
4 1.2549 1.2261 1.2404 1.2482 1.2340 1.2411
5 1.2687 1.2379 1.2532 1.2615 1.2464 1.2540
6 1.2870 1.2548 1.2708 1.2795 1.2640 1.2717
7 1.3070 1.2716 1.2892 1.2985 1.2821 1.2903
8 1.3336 1.2918 1.3125 1.3232 1.3048 1.3139
9 1.3492 1.3063 1.3276 1.3386 1.3203 1.3294
10 1.3663 1.3182 1.3421 1.3538 1.3345 1.3441
11 1.3932 1.3387 1.3657 1.3782 1.3579 1.3680
12 1.4144 1.3596 1.3867 1.3995 1.3794 1.3894
could be obtained by taking the arithmetic average
of the June and July year-over-year monthly indices
pertaining to the years 1970 and 1971 (see the
entries for months 6 and 7 for the year 1971 in Table
22.3, 1.0844 and 1.1103). 21 For the next roll-
21 If an average of the year-over-year monthly indices for
May, June, July, and August were taken, a better approximation
to the annual index could be obtained, and if an average
of the year-over-year monthly indices for April, May,
June, July, August, and September were taken, an even bet-
(continued)
ing-year fixed-base Laspeyres index corresponding
to the January 1972 entry in Table 22.18, an approximation
to this rolling-year index, P ARY , could
be derived by taking the arithmetic average of the
July and August year-over-year monthly indices
pertaining to the years 1970 and 1971 (see the entries
for months 7 and 8 for the year 1971 in Table
22.3, 1.1103 and 1.0783, respectively). These
ter approximation could be obtained to the annual index,
and so on.
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