## Psychometric methodsPsychological measurement; Psychophysical theory; A mathematical introduction; The method of average error; Method of minimal changes; The constant methods; The method of pair comparisons; The method of rank order; Scaling from interval and ration judgements; The method of successive categories and other scaling methods and problems; Rating scales; Principles of judgment; Theory of psychological tests; Reliability and validity of measures; Test development; Factor analysis. |

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Extremely important foundational psychometrics book that had a huge impact on applied research and test construction. Much has been improved since the 1950s, but this is truly a classic.

### Contents

Psychophysical Theory | 20 |

A Mathematical Introduction | 43 |

The Method of Average Error | 86 |

Copyright | |

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### Common terms and phrases

ability 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 distribution effect equal equation estimate examinees experiment experimental factor analysis factor loadings Fechner's formula frequency function given greater hyperplanes indicate individuals intercorrelations interval interval scale item analysis judged limen limits linear logarithms matrix mean measurement median method multidimensional scaling normal normal distribution objects observations obtained operations 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 values Table theory Thurstone tion total score traits transformation true variance validity variable vectors Weber's law weights zero