Word: formulae
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Dates: during 1960-1969
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...formula is empirically derived from the actual rank list standing of Harvard students and is revised whenever a significant error shows up-about once every three years...
...actual scores and class ranking are the variables in these three formulae. To find the PRL, the derivatives from the three are weighted in one of two proportions, depending on whether the applicant comes from a public or private school. In the public school formula, the class ranking derivative is 47 per cent of the PRL, verbal aptitude 23 per cent, and the average of achievement scores 30 per cent. For private school graduates it is 48 per cent, 20 per cent, and 32 per cent...
Aptitude is more heavily weighted in public schools because the quality of instruction is slightly lower. But according to Whitla, with each revision of the PRL formula the percentages come closer to identity, "probably because the teaching in public schools is improving...
...curiosity of the formula is the omission of the College Board mathematics aptitude score, considered very important by most high school advisors. Whitla said that the score is left out because experiments have shown that including it does not increase the PRL formula's ability to predict...
Glimp explained that math aptitude shows up significantly in achievement scores and in rank in class. Hence the mathematical capabilities of the Harvard applicants are indirectly included in the PRL formula...