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Appendix table 1. Survey establishment response, March 2017 Establishments Civilian Private industry State and local governments Total in sampling frame(1).............. 6,211,244 5,978,422 232,822 Total in sample..... 11,400 9,802 1,598 Responding(2)..... 8,175 6,728 1,447 Refused(3)........ 2,149 2,009 140 Out of business or not in survey scope... 1,076 1,065 11 1 The sampling frame was developed from state unemployment insurance reports and is based on the 2012 North American Industry Classification System (NAICS). With some minor exceptions, an establishment is a single economic unit that engages in one, or predominantly one, type of economic activity. For private industry, the establishment is usually at a single physical location such as a mine, factory, office, or store; if a sampled establishment is owned by a larger entity with many locations, only the employment and characteristics of the establishment selected for the sample are considered for the survey. For state and local governments, an establishment can include more than one physical location, such as a school district or a police department. 2 Establishments that provided data at the initial interview. 3 Establishments that did not provide data at the initial interview. Data for establishments not responding at the time of update interviews are imputed. Detailed information on nonresponse adjustment and imputation can be found in BLS Handbook of Methods, Chapter 8, “National Compensation Measures,” Bureau of Labor Statistics, on the Internet at www.bls.gov/opub/hom/pdf/homch8.pdf. Source: Bureau of Labor Statistics, National Compensation Survey.