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Primary completion rate (PCR) is the number of students successfully completing the last year of (or graduating from) primary school in a given year, divided by the number of children of official graduation age in the population. Because of difficulties with developing data based on this definition, data analysis is generally based on the PCR proxy indicator which is the number of children reaching the last year of primary school (as defined by a country) net of repeaters. The indicator, which monitors education system coverage and student progression, is intended to measure human capital formation and school system quality and efficiency and relates to the second MDG to achieve universal primary education.