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A MATHEMATICAL INTRODUCTION
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adaptation level Amer applied arithmetic mean assume assumption average axes centroid Chap coefficient column common factors comparative judgments computed continuum correct correlation corresponding criterion curve determined difficulty discriminal dispersions distribution effect equal equation estimate examinees experiment experimental factor analysis factor loadings Fechner's formula frequency function geometric mean given greater hyperplanes indicate intercorrelations interval interval scale item analysis judged limen limits linear logarithms matrix mean Measmt measurement median method multidimensional scaling normal normal distribution observations obtained pair comparisons phi coefficient positive predicted probably problem procedure proportion Psychol psychological psychometric function Psychometrika psychophysical psychophysical methods range rank order raters ratings ratio regression reliability responses rotation sample scale values solution square standard deviation standard error statistical steps stimuli stimulus value Table theory Thurstone tion total score traits transformation true variance validity variable vectors Weber's law weights zero