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2. Angrist, J. D., and J.-S. Pischke. 2015. Mastering ‘Metrics: The Path from Cause to Effect. Princeton, NJ: Princeton University Press.
3. Archer, P., and S. Weir. 2005. Addressing Disadvantage: A Review of the International Literature and of the Strategy in Ireland. Report to the Educational Disadvantage Committee. Dublin: Department of Education and Science. https://www.erc.ie/documents/edc_addressing_disadvantage.pdf.
4. Grading quality of evidence and strength of recommendations
5. Comment: Educational Research:The Hardest Science of All