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Number of years of schooling that a child of a certain age can expect to receive in the future, excluding years spent repeating grades. The indicator reflects the overall level of development of an education system in terms of the average number of years of schooling without repetition that can be offered to the school-age population, including those who never enter school. It is calculated as the sum of the age specific enrolment rates for the given level of education, plus the number of pupils of unknown age in the given level of education divided by the school-age population for that level of education, and multiplied by the duration of that level of education, minus the number of repeaters in a given level of education divided by the school-age population for that level, multiplied by the duration of that level of education.