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Applying the Laspeyres formula in General:100( )0000xWPPW xItt∑∑=→(1)Of which: I t → 0 consumer price index reports t compared to the original period fixed 0;PTConsumer prices reports t;P0The original period consumer prices 0;W0 the right fixed number States the root of 0.For more advantages in solving problem of selecting new items to replace itemsold is no longer marketed, temporary items or items of quality changes,The consumer price index is calculated according to the Laspeyres formula convert-or methodcompared with the original short term period. This recipe is fully compatible with the formula (1) haveGeneral form as follows:1 00 110 0 − → → −=→ = ∑i tj tj tnjjI t W xI xI (2)Of which:t → 0I: the consumer price index, reported t compared to the original period fixed 0;t → t − 1I j: j commodity group price index, in comparison with the previous report t report t-1;t − 1 → 0I j: j commodity group price index last month, the report compared to the original problem Statesdefault 0;0WJ: rights group j-term fixed root items 0.
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