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Foy, Pierre, Ed.; Arora, Alka, Ed.; Stanco, Gabrielle M., Ed. – International Association for the Evaluation of Educational Achievement, 2013
This supplement contains documentation on the explicit and implicit stratification variables included in the TIMSS 2011 data files. The explicit strata are smaller sampling frames, created from the national sampling frames, from which national samples of schools were drawn. The implicit strata are nested within the explicit strata, and were used…
Descriptors: Predictor Variables, Sampling, Comparative Education, International Education
Garden, Robert A. – 1987
This report provides users of data from the Second International Mathematics Study with a summary of the survey procedures used by participating countries. The introductory chapter includes definitions, cross-sectional and longitudinal components, and recommended sampling procedures. Chapter 2 presents national population definitions and sampling…
Descriptors: Data Analysis, Educational Assessment, Guidelines, International Studies