The 1978 CPI revision introduced probability sampling methods at all stages of CPI sampling.
Sources
- Chronology of changes in the Consumer Price Index (bls.gov)
- https://www.elibrary.imf.org/display/book/9789221136996/C05.xml (elibrary.imf.org)
- https://www.nationalacademies.org/read/26485/chapter/4 (nationalacademies.org)
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