1. perccalc::pisa_2006
    Mathematics test scores of Spain, Germany and Estonia in the PISA 2006 test
    csv| xlsx| json| ndjson| rda| rds
    data.frame|25884 x 6
  2. perccalc::pisa_2012
    Mathematics test scores of Spain, Germany and Estonia in the PISA 2012 test
    csv| xlsx| json| ndjson| rda| rds
    data.frame|35093 x 6