* *Median value is 1998 is lower due to a large number of counties reporting no such establishments. Better reporting is found in the years 1999 and onward, and so SAGE Stats recommends basing comparisons on the years 1999 and onward. Since 2007, CBP has used Noise Infusion for this data as a method of disclosure avoidance. This new method allowed disclosure of data for many more counties, which may affect the national median value. Prior to 2007, data were protected using the complementary cell suppression method. For more information on Noise Infusion and Suppression, see the Source tab.
Years Available: 1998–2017
Permanent Link: http://data.sagepub.com/sagestats/4644
General Notes: *Median value gives the value for the "average" county for this metric, the 50th percentile of all counties reporting data.