data.frame s. Statistical units are teachers. Each dataframe represents one variable from the questionnaire, "variables" represent this variable categories. There are 2 variables for teachers and 3 variables for students (taught by that teacher). The names of variables are the the names of list items and are thoroughly explained in the TIMSS Advanced 2008 documentation at the website of IEA.
The variables are mostly categorical, the numerical ones were categorized according to the 5 equidistant quantiles. One teacher and 20 students were excluded due to many missing values.
A list of 5 data.frames (variables). The variables (data.frames) are
teachers' years teaching: [2,10], (10,15], (15,21], (21,26.6],(26.6,35]
teachers' professional interaction with coworkers: never or almost never, 2-3 times per month, 1-3 times per week, daily or almost daily
students' gender: GIRL, BOY
quantification of frequency of reviewing homework: every or almost every lesson, about half the lessons, some lessons, never
minutes per week of doing homework: [0,30], (30,60], (60,120], (120,180], (180,600]
The International Association for the Evaluation of Educational Achievement (IEA) http://www.iea.nl/data.html
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