Answer: In order to perform statistical analyses using the TIMSS data, you will need to download the IEA IDB Analyzer software. Used in conjunction with SPSS, the IEA IDB Analyzer allows you to merge the various data file types of the TIMSS database. The software generates SPSS syntax that takes into account information from the sample design in the computation of statistics and their standard errors. In addition, the generated SPSS syntax makes use of plausible values for calculating estimates of achievement scores and their standard errors, combining both sampling variance and imputation variance.