## A Comparison of Two Methods for Studying Test Items |

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### Contents

Theoretical | 23 |

Relationships Between LPA and | 34 |

A Special Case of LPA for Application | 43 |

11 other sections not shown

### Common terms and phrases

1964 Advanced Test achievement items achievement test items algebraic algorithm alpha factor analysis approximation basic Canonical Factor Analysis categorical data Chapter columns compute content validity conventional factor analysis correlation matrix derived categories diagonal matrix difficulty factors discussed Educational Testing Service empirical studies entries equations Factor Intercorrelations Obtained Factor Pattern Matrix Factors Factor Number Graphs Group Harris and Kaiser homogeneous test Image Analysis inequalities internally consistent interpretations item content item stem January Kaiser and Caffrey latent categories Level I Test linear LPA method LPA model LPA study manifest category MC titles measure methods for studying number of factors Obtained for 1965 orthonormal matrix Pattern Matrix Obtained Phi Coefficients principal components analysis problem procedure Pythagorean Theorem relationships rescaling response data analysis rotation scores set of items solution sorters specific subsets of items Table Tetrachoric Correlations trigonometric functions trigonometric identities variables weaker lower bound