So unusual research shows that independent school pupils score nearly two thirds of a GCSE grade better than otherwise comparable state school pupils (Private schools add two years of education,say researchers, 26 February).
But does this necessarily indicate greater attainment? Might it not indicate the well-known “halo effect” that operates when the grades awarded by assessors are affected (positively or negatively) by their expectations of the different individuals or groups whose work they are assessing.
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Source: theguardian.com