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Employment Development Department
Employment Development Department
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Occupational Wage Data Are Not a Continual Time Series (Continued)

  Designed as Point-in-Time Estimates
  The Methodology Itself Affects the Comparability of Estimates
  Procedural Changes
  Other Changes
Other Changes

Finally, OES has implemented other changes, like semi-annual collection and estimation and the conversion to the industry coding using NAICS.  These also have an effect on comparability of the data.

See the "Occupational Employment and Wages Technical Note" on the Bureau of Labor Statistics Web site for additional technical information about the OES survey.

In conclusion, the use of OES data for time series analysis is not encouraged.  If you plan to make such comparisons, you should understand that changes in both the survey methodology and procedures over the last several years influence the comparability of the wages over time.

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