RT Report T1 Sampling efficiency of national, EU and global stratifications A1 Metzger, M. J. A1 Brus, D. J. A1 Ortega, M. AB Stratification, dividing the statistical population into less heterogeneous subgroups before sampling, can help improve sampling efficiency by improving representativeness and reducing sampling error. This report explores the added sampling efficiency that is achieved by using the European Environmental stratification for estimating the area covered by the 25 Corine Land Cover (CLC) categories occurring in the semi-natural and managed terrestrial habitats of the wider-countryside. Although the dataset is not ideally suited to assess stratification efficiency for EBONE, the results give some encouragement. The analysis indicates that the pan-European stratification improves sampling efficiency for several land cover categories and performs similar to four more detailed national stratifications, supporting their use as a basis for designing a pan-European biodiversity observation network. PB Alterra SN 1566-7197 YR 2012 FD 2012-01 LK https://hdl.handle.net/20.500.14352/49230 UL https://hdl.handle.net/20.500.14352/49230 LA eng NO Unión Europea. FP7 NO Dutch Ministry of Economics, Agriculture and Innovation DS Docta Complutense RD 20 abr 2025