<P> The collected information is presented in different formats . For example, for TIMSS 2015 the results are presented as TIMSS International Results in Science TIMSS International Results in Science and TIMSS International Results in Mathematics . The TIMSS 2015 Encyclopedia provides an overview of how mathematics and science are taught in each participating country . Methods and Procedures in TIMSS 2015 documents the development of the TIMSS assessments and questionnaires, and describes the methods used . The TIMSS 2015 User Guide for the International Database describes the content and format of the data in the TIMSS 2015 International Database . The fully documented TIMSS 2015 international database can be downloaded . </P> <P> The IEA has developed an application for working with data from TIMSS and other IEA large - scale assessments called the "IEA International Database (IDB) Analyzer"... This application allows researchers to combine data files and facilitates some types of statistical analysis (such as computing means, percentages, percentiles, correlations, and estimating single level multiple linear regression). The application takes into account the complex sample structure of the databases when calculating the statistics and their standard errors . It also allows researchers to estimate achievement scores and their standard errors . </P> <P> For an overview of the IEA study results and interpretation of information, the IEA's "Data Visualizer". can come in handy . </P> <P> In TIMSS 1995, there were 41 educational systems in five grades (third, fourth, seventh, eighth, and the final year of secondary school). In 1999, TIMSS only focused on the eighth grade in 38 educational systems; there was no study done for the fourth grade in that year . In TIMSS 2003, there were 26 educational systems for the fourth grade and 48 for the eighth grade . In TIMSS 2007, 44 educational systems participated in the fourth grade and 57 educational systems in the eighth grade . TIMSS 2011 had 52 participating educational systems for the fourth grade and 45 for the eighth grade . </P>

Which county has one of the highest timss achievement scores