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

A C H I E V E M E N T S C O R E S C H A P T E R 6
6.2 Achievement Scores in the School Background Files
Although the achievement scores are computed at the individual level, several summary
variables of achievement are included in the School Background data files. These correspond
to the average achievement scores within the school, in mathematics and science, by grade
level. The variables are identified below.
ACLGMAT Mean Mathematics Achievement at the Lower Grade – Population 1
ACLGSCI Mean Science Achievement at the Lower Grade – Population 1
ACUGMAT Mean Mathematics Achievement at the Upper Grade – Population 1
ACUGSCI Mean Science Achievement at the Upper Grade – Population 1
BCLGMAT Mean Mathematics Achievement at the Lower Grade – Population 2
BCLGSCI Mean Science Achievement at the Lower Grade – Population 2
BCUGMAT Mean Mathematics Achievement at the Upper Grade – Population 2
BCUGSCI Mean Science Achievement at the Upper Grade – Population 2
BCEGMAT Mean Mathematics Achievement at the Extra Grade – Population 2
BCEGSCI Mean Science Achievement at the Extra Grade – Population 2
Note that, although most countries tested across two grades per the target population
definition, Switzerland and Sweden opted to test students in an extra grade at Population
2, and therefore the variables BCEGMAT and BCEGSCI are set to missing in all but these
two countries.
T I M S S D A T A B A S E U S E R G U I D E 6 - 9