Appendix table 1. Survey establishment response, private industry, National Compensation Survey, 2011 Establishments Number of establishments Total in sampling frame(1)................... 4,802,599 Total in sample............................ 3,226 Responding............................... 2,206 Refused or unable to provide data........ 754 Out of business or not in survey scope... 266 1 The list of establishments from which the survey sample was selected (sampling frame) was developed from State unemployment insurance reports and is based on the 2007 North American Industry Classification System (NAICS). For private industries, an establishment is usually a single physical location.