によって Shu Braque 13年前.
381
Price index
Price index
devide
price indexes
a time series of
easier
to
deal with
each price level
by
given constant
example
prices rose
on average
2.68%
January to February
(624.00 - 607.70)/607.70
3.42%
January to March
price index
103.42
102.68
100
April 1, 2008
628.50
March 1, 2008
624.00
Feb 1, 2008
607.70
Jan 1, 2008
base
interested in
not
particular value
percentage change
price level