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TECHNICAL NOTE The Employment Cost Index (ECI) measures the change in the cost of labor, free from the influence of employment shifts among occupations and industries. For information on survey concepts, coverage, methods, nonresponse adjustment, and imputation see National Compensation Measures Handbook of Methods at www.bls.gov/opub/hom/ncs/home.htm. Sample size Data for this reference period were collected from a probability sample of approximately 28,100 occupational observations selected from a sample of about 7,000 private industry establishments and approximately 7,600 occupational observations selected from a sample of about 1,400 state and local government establishments that provided data at the initial interview. Beginning December 2021, an additional (fourth) private industry sample is used in estimation to mitigate the impact of decreasing response rates. Standard errors To assist users in ascertaining the reliability of ECI series, standard errors of all current quarter not seasonally adjusted 3- and 12-month percent change series are also available, see www.bls.gov/eci/factsheets/eci-standard-errors.htm and the database query tool at www.bls.gov/eci/data.htm. Standard errors provide users a measure of the precision of an estimate to ensure that it is within an acceptable range for their intended purpose. Historical listings Historical ECI data are available in xlsx format at www.bls.gov/eci/tables.htm. The continuous occupational and industry series listing uses the Standard Industrial Classification (SIC) Manual and Occupational Classification System (OCS) series from 1975 through 2005 and the North American Industry Classification System (NAICS) and Standard Occupational Classification (SOC) from 2006 to the present. It provides the official series deemed continuous after the change in classification systems. For more information on the criteria used in defining continuous series, see the article published in the Monthly Labor Review at www.bls.gov/opub/mlr/2006/04/art2full.pdf. Employer Costs for Employee Compensation data The costs per hour worked of compensation components are published as part of the Employer Costs for Employee Compensation (ECEC) news release. The ECEC release dates are available at www.bls.gov/schedule/news_release/ecec.htm. Historical ECEC data are available in xlsx format at www.bls.gov/eci/tables.htm. Since the ECEC is calculated with current employment weights rather than the fixed weights used in computing the ECI, year-to-year changes in the cost levels usually differ from those in the ECI. Fixed employment weights For additional information on the use of fixed employment weights in computing the ECI, see www.bls.gov/opub/mlr/2016/article/introducing-2012-fixed-employment-weights-for-the- employment-cost-index.htm. Beginning with the December 2022 release, the ECI is introducing new employment weights, see www.bls.gov/eci/notices/2022/eci-2021-fixed-weights-and-2018-socupdate.htm. Additional information Historical tables are available in xlsx format for constant dollar, current dollar, and continuous series, see www.bls.gov/eci/tables.htm. ECI release dates are available on the release calendar at www.bls.gov/schedule/news_release/eci.htm. Subscribe to receive the BLS Economic News Release email at public.govdelivery.com/accounts/USDOLBLS/subscriber/new. If you are deaf, hard of hearing, or have a speech disability, please dial 7-1-1 to access telecommunications relay services.