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Occupational Wage Data Are Not a Continual Time Series

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

The Occupational Employment Statistics (OES) Survey was designed to provide accurate point-in-time wage estimates for the nation, states, and each Metropolitan Statistical Area (MSA).  
The use of OES data for time series analysis, or comparing onetime period to another is not encouraged.

Some reasons that make the use of OES less useful for comparisons of two or more points in time include changes in survey methodology, improvements in data collection, and changes in the structure of the coding system used to classify occupations in OES.

If you choose to make such comparisons, you should understand the changes in both the survey methodology and procedures over the last several years that will affect the comparability between time periods.

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