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Table 7 R2 (explained variance of achievement score) by country (PIRLS)

From: Evaluating the risk of nonresponse bias in educational large-scale assessments with school nonresponse questionnaires: a theoretical study

Country Participation rate of schools (before replacement) (%) Standard model Country-specific model
R2 (adj.) R2 (adj.)
Belgium (French) 77 0.55 (0.06) 0.51 (0.08)
England 75 0.55 (0.07) 0.55 (0.07)
Netherlands 68 0.32 (0.09) 0.47 (0.07)
Northern Ireland 62 0.43 (0.09) 0.57 (0.17)
Norway 57 0.28 (0.06) 0.42 (0.12)
  1. Standard errors appear in parenthesis