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Most of these studies were based on small and nonrepresentative samples and did not examine school funding directly but rather funding-associated school characteristics ( such as teacher salaries ) that may not have simple ties with achievement . Priscian , the semantically-oriented grammarian who wrote at the beginning of the sixth century A.D ., was particularly influential , and his views were repeated by many later grammarians , as well as by logicians and theologians . Sometimes , facts are changed to protect coworkers . A total of 214 questionnaires were received , representing a return rate of 26 percent .