Definition
Achievement scores are based on assessments administered as part of the OECD PISA programme, which was carried out in 2006 (with a special focus on science). Students refer to 15-year-olds enrolled in secondary education. Science-related careers include those that involve a considerable amount of science, plus those careers that involve tertiary education in a scientific field as well as some specific careers such as engineer, weather forecaster, optician and medical doctor. Specifically, students were asked "What kind of job do you expect to have when you are about 30 years old?". Answers were then coded using ISCO codes.
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