The Bureau of Labor Statistics first published a seasonally adjusted CPI index in 1966.
Notes on verification
Confirmed by multiple independent BLS historical documents, including the agency's own official timeline of methodology changes. [tier=silver indep_score=0.925 clusters=2 claim_tier=notable]
Sources
- Was There a Great Moderation for Inflation Volatility? (seed:economics_and_business)
- https://www.bls.gov/cpi/seasonal-adjustment/timeline-seasonal-adjustment-methodology-changes.htm (corroboration)
- https://fraser.stlouisfed.org/files/docs/publications/bls/bls_1366_1963.pdf (corroboration)