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As a school leader or head of subject you are required to analyse attainment data relating to whole cohorts of learners. From this analysis you need to produce timely interventions and measurable initiatives to improve the very performance you are monitoring. This requires data analysis - something that most teachers and leaders either find daunting or only address in a superficial manner. Covering chapters on Data Analysis, Problems With The Mean, Comparative Statistics, Analysis Of Variance and the incredibly powerful General Linear Model (GLM) - this is a text book for real teachers faced with real issues in real classrooms.