Representative sampling TÓTH Gábor DG EMPL - Impact Assessment and Evaluation Unit ESF Evaluation Partnership meeting, Brussels, 12-13 March, 2015
Previous steps Draft guidance on representative sampling Learning seminar in June Section in main guidance in July Suggestion for modified guidance in November Follow up with PL
Structure of the session Existing guidance – ESF Data Support Centre Simulation – Polish representative New guidance - COM
Relative standard error: 2% Simulation by PL Relative standard error: 2% Standard error: 2% Standard error: 5% Total reference population size 395,711 Sample size 142,485 7,822 1,386 Cost of the survey (4.5€/interview) €641,183 €35,199 €6,237 Total cost €661,883 €55,899 €26,937
New guidance Calculation method: standard error instead of relative standard error Confidence level: 95% Precision thresholds 0-2%: High precision – very reliable 2-5%: Acceptable - reliable 5-10%: Low precision – not sufficiently reliable More than 10%: Very low precision – not reliable