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The Bivariate Frequency Distribution of Test Score
The Frequency Distribution of Test Scores
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50 per cent ability score Actual solid circles answered correctly assumptions bivariate distribution bivariate frequency distribution calculated cent difficulty conditional distribution correctly by guessing curvilinear correlation discriminating power discrimination index distribution of ability distribution of test Distributions of Scores Equation equivalent items error of measurement examinees tested F0GURE formula given level group of examinees group tested item characteristic curve item correctly item difficulties J. P. Guilford level of ability matrix of tetrachoric normally distributed number of items numerical integration Observed Distributions obtained platykurtic PSYCHOMETRIC SOCIETY rectangular regression curve regression of test relative score relative true score result Scatter Diagram score distributions score on ability Scores on Test SCORES TEST SCORES Theoretical hollow Showing Actual Frequencies specified standard deviation standard error Table Test 82 test composed Test h test items test score tetrachoric correlation tetrachoric item intercorrelations Theoretical and Observed Theoretical hollow circles tion univariate values of Rt variable