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Table 6 The average number (n) of not-reached items and comparison of position effects in PISA 2012 mathematics between the complete sample and the reduced sample with students with not-reached item responses excluded in three selected countries

From: Predictors of individual performance changes related to item positions in PISA assessments

Country n Complete sample Reduced sample
Cluster SE Cluster SE
Colombia 5.04 −.138 .007 −.107 .008
Peru 5.80 −.122 .008 −.081 .010
Uruguay 4.59 −.136 .009 −.117 .010