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Kevin Roche

U.S. Bureau of Labor Statistics



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Julie Gershunskaya

U.S. Bureau of Labor Statistics



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498 – Improving Data Quality and Estimation Methods for the Current Employment Establishment Survey

Construction and Assessment of Generalized Variance Functions for an Establishment Survey

Sponsor: Social Statistics Section
Keywords: Generalized Variance Functions, R, Establishment Surveys, Balanced Repeated Replication, Cluster Variables

Kevin Roche

U.S. Bureau of Labor Statistics

Julie Gershunskaya

U.S. Bureau of Labor Statistics

The Bureau of Labor Statistics Current Employment Statistics (CES) survey leads to the creation of measures which are used to create Principal Federal Economic Indicators. One of those measures is the monthly change in establishment jobs, which CES estimates for detailed industries as well as geographic domains such as states and metropolitan areas. CES calculates sampling errors using Balanced Repeated Replication, but estimates of sampling variance can be volatile and may not be available as readily as desired. Generalized Variance Functions (GVF) are fit using regression models to existing direct estimates of sampling variance to improve estimates of those variances. A GVF should provide good fits for data used to construct the model, and it should provide good estimates of variances for other observations not used in the model. This paper develops a GVF model for ratio estimators and considers two main characteristics: accuracy in terms of confidence interval coverage, and stability. Metrics and tests for each characteristics are developed. We also consider and test new model types to further increase coverage and stability of the GVF variances.

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