Search for: [Abstract = "The analyses of influence of class size on academic achievement used data from study conducted in 2006 bythe Regional Examination Board in Cracow \(Poland\). The variables explaining the achievements of lowersecondary school pupils were identified using regression analysis. The model explains 71% of variance ofexam results. These variables were used to identify statistical twins. Their assignment to the experimentaland control group was performed in three ways\: by stratification using Mahalanobis distance, matching one\-to\-many and one\-to\-one using k\-means method. The last method proved the most successful. The effect ofclass size on student outcomes proved statistically insignificant. However, pupils from classes with below23 pupils achieved higher mean scores than their peers from larger classes by 0.039 standard deviation."]

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