Original Sampling (2005)

Private workplace

• Population : Workplaces with 30 or more employees. Workplaces in agricultural, forestry, fishery and mining industries were excluded.
• Sample frame : Data from the『Census on Establishments issued by the Statistics Korea s of the end of December 2004.
• Sampling method : Stratification sampling using regional(5), industrial(12), and workplace size(4)
• Sampling result : 3,916 workplaces

Additional Sampling (2015)

Private workplace

• Population : Workplaces with 30 or more employees. Workplaces in agricultural, forestry, fishery, mining industries and educational services were excluded.
• Sample frame : Data from the 「Census on Establishments」 issued by the Statistics Korea as of the end of December 2014.
• Sampling method : Stratification systematic sampling using industrial(10), and workplace size(4)
• Sampling result : 13,831workplaces