EDSTATS: Adjusted Primary Science Score
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A test score that has been standardized over time and across various international and regional science assessments taken at the primary school level. It is calculated by creating a ratio between U.S. primary science scores on international tests (such as PISA and TIMSS) to primary science scores on the U.S. National Assessment of Educational Progress (NAEP) approximated to the nearest 5-year time step from 1965-2010. All raw primary science international scores are approximated to the nearest 5-year interval, averaged, and then multiplied by this ratio. This makes these adjusted scores comparable over time, across countries and across international tests. Primary science test scores from countries which only participate in regional assessments are included in the above transformation after being multiplied by a ratio comparing average primary science scores in a given regional test and primary science scores on an international assessment for all doubloon countries - countries which participate in the same regional assessment and an international test. This makes adjusted primary science test scores comparable over across time, over countries and over all assessments. Bron: …