User Guide for the TIMSS International Database.pdf - TIMSS and ...

C H A P T E R 1 I N T R O D U C T I O N
These files are further described in Chapter 7. Each variable in the TIMSS database is
designated by an alphanumeric variable name. Throughout this guide, these variables and the
appropriate use of them in conducting analyses are described.
1.5 Contents of the User Guide
Given the size and complexity of the TIMSS International Database, a description of its
contents is also complicated. It is recommended that the user read through this guide to
understand the study and get a sense of the structure and contents of the database, prior to
trying to use the files contained on the CDs. During this first reading, there may be particular
sections that the user can skim and other sections that the user may want to read more
carefully. Nonetheless, a preliminary read-through (before actually opening up the files and
trying to use them) would help the user better understand the complexities of the study and
the International Database. When using the files, the user will need to follow certain sections
of this guide more carefully than others and refer to the supplements to the guide. The
contents of each chapter and the supplements are summarized below.
Chapter 2: TIMSS Instruments and Booklet Design
This chapter describes the content and organization of the TIMSS tests for the lower and
upper grades of Populations 1 and 2; the performance assessment administered to subsamples
of the upper-grade students in Populations 1 and 2; and the student, teacher, and school
background questionnaires. The TIMSS item release policy also is described.
Chapter 3: Sampling and Sampling Weights
This chapter describes the sampling design for TIMSS, the use of sampling weights to obtain
proper population estimates, and the weight variables included in the data files.
Chapter 4: Data Collection, Materials Processing, Scoring, and
Database Creation
This chapter describes the data collection and field administration procedures used in TIMSS,
the scoring of the free-response items, data entry procedures, and the creation of the
International Database, including the data verification and database restructuring.
Chapter 5: TIMSS Scaling Procedures
This chapter provides an overview of the scaling methodology used by TIMSS, including a
description of the scaling model, plausible values technology, the international calibration
sample, and standardization of the international scale scores.
Chapter 6: Student Achievement Scores
This chapter describes the student-level achievement scores that are available in the
International Database, including how they were derived and used by TIMSS, and how they
can be used by secondary analysts.
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