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Apply Laspeyres general formula:
100
()
0
0
0
0
x
W
PP
W x
i
t
t
cr
cr
=
→
(1)
Where: I t → 0 Consumer price index reporting period as compared to the original t fixed 0;
Pt
consumer Price reporting period t;
P0
consumer price base period 0;
W0 weights fixed base period 0.
for more advantages in solving problems selecting new items replace items
not old also sold in the market, seasonal items or change the quality of goods,
the consumer price index is calculated by the formula Laspeyres convert - or methods
compared with the original short-term period. This formula is fully compatible with the formula (1) has
the general form as follows:
1 0 1
1
0 0 - → → -
=
→ = Σ tj tj t
n
j
j
i t W slag slag (2)
Of which :
t → 0
I: consumer price index reporting month t compared with fixed base period 0;
t → t-1
i j: commodity group price indices t j month reporting statements from the previous month t-1;
t-1 → 0
i j: commodity group price indices j months before the reporting month compared to the original attempt
to 0;
0
WJ: the right number of commodities fixed base period 0 j.
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