The Weighting of Tests Measuring the same Function in Terms of their Length
ers in the field assign weights to tests which, although numerically arbitrary, are claimed to be based on a variety of reasons which range from the very trivial to quite impor tant ones. It is the purpose of this article, as the title indicates, to provide a simple method of weighting tests to be combined into a sum, in terms of their length, which, although de signed for tests measuring the same function, may be expected to yield approximately cor rect results when dealing with tests measur ing similar functions such as those given in a school course of rather uniform subject matter. Kelley1 has given the formula