| http://www.w3.org/ns/prov#value | - It found large differences among teachers in terms of their value-added impact on student achievement and went on to note that this variation was not readily explained by factors such as graduate degrees or experience after the first few years in the profession.[1] A 1999 paper, meanwhile, estimated that only 3 percent of the variation in student achievement could be traced back to measurable teac
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