Analyzing Data from a National Assessment of Educational Achievement is the fourth of five volumes in the National Assessments of Educational Achievement series. Part I provides a general introduction to the statistical analyses normally carried out in large-scale assessments. These include the calculation of measures of central tendency and dispersion, standard errors, and correlation; comparing mean scores; and identifying low and high performers. Part II describes item and test analysis using both classical test and item response theories. Topics addressed include analysis of pilot and final test data, treatment of missing data, differential item functioning, test dimensionality, linking assessment results, rotated booklet designs, setting proficiency or performance levels, and scaling. An accompanying CD contains specially designed item and test analysis software as well as exercises and supporting data files for both parts of the volume. This volume is intended primarily for teams who are responsible for conducting national assessments and others interested in statistical analysis and psychometrics. Read Less