How to develop a usable CPI series form the available CPI of different base year?

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Lall B. Ramrattan

Generally, you can change the base year of a series with a little arithmetic shown in the attach file. However, in the US, the BLS publishes conversion factor to do this.

Md Fuad

Thanks a lot.

Ette Etuk

It is straightforward to harmonize CPI's with different bases. Suppose CPI1 has base at time t1 and CPI 2 with base t2. CPI2 can be written with base t1 by multiplying by a factor 100x(value at t2)/(value at t1).