Actual reporting population
Article 2
1. The actual reporting population shall consist of resident MFIs except central banks and MMFs drawn from the reference reporting population and selected by NCBs. NCBs shall select the actual reporting population either through a census or a sample. 2. In the case of a sample, the NCBs shall stratify the reference reporting population into homogeneous strata and then either select the actual reporting population at random from each stratum or select the largest institutions within each stratum. 3. In the case of random sampling selection, the minimum national sample size shall be such that the maximum random error at national level does not on average exceed 10 basis points at a confidence interval of 90 %. Where the largest institutions are selected, the minimum national sample size shall comply with a similar level of quality measure on the basis of a function of the estimated mean absolute value of the errors. 4. NCBs shall also apply the formulas and criteria for the selection of the actual reporting population set out in Guideline ECB/2007/9 of 1 August 2007 on monetary, financial institutions and market statistics ( 6 ) . 5. Each NCB shall inform its resident reporting agents about their statistical reporting requirements following national procedures. 6. The Governing Council shall be entitled to check compliance with this Article.