To help encourage interest in psychometrics, the following classic articles and monographs are freely available for download.

• Stout, W. (2002). Psychometrics: From Practice to Theory and Back (15 Years of Nonparametric Multidimensional IRT, DIF/Test Equity, and Skills Diagnostic Assessment). Psychometrika 67(4) 485-518.



• Lingoes, J. C. & Roskam, E. E. (1973). A Mathematical and Empirical Analysis of Two Multidimensional Scaling Algorithms (Psychometrika Monograph No. 19). Richmond, VA: Psychometric Society.



• Samejima, F. (1972). A General Model for Free-Response Data (Psychometrika Monograph No. 18). Richmond, VA: Psychometric Society.



• Samejima, F. (1969). Estimation of Latent Ability Using a Response Pattern of Graded Scores (Psychometrika Monograph No. 17). Richmond, VA: Psychometric Society.



• Herzberg, P. A. (1969). The Parameters of Cross-Validation (Psychometrika Monograph No. 16). Richmond, VA: Psychometric Society.



• Mcdonald, R. P. (1967). Nonlinear Factor Analysis (Psychometrika Monograph No. 15). Richmond, VA: Psychometric Corporation.



• Clemans, W. V. (1966). An Analytical and Empirical Examination of Some Properties of Ipsative Measures (Psychometrika Monograph No. 14). Richmond, VA: Psychometric Society.



• Mckeon, J. J. (1966). Canonical Analysis: Some Relations Between Canonical Correlation, Factor Analysis, Discriminant Function Analysis, and Scaling Theory (Psychometrika Monograph No. 13). Richmond, VA: Psychometric Society.



• Burket, G. R. (1964). A Study of Reduced Rank Models For Multiple Prediction (Psychometrika Monograph No. 12). Richmond, VA: Psychometric Corporation.



• Paul Kelley, H. H. (1964). Memory Abilities: A Factor Analysis (Psychometrika Monograph No. 11). Richmond, VA: Psychometric Corporation.



• Tucker, L. R. (1963). Format Models for a Central Prediction System (Psychometrika Monograph No. 10). Richmond, VA: Psychometric Corporation.



• Stake, R. E. (1961). Learning Parameters, Aptitudes, and Achievements (Psychometrika Monograph No. 9). Richmond, VA: Psychometric Corporation.



• Roff, M. (1952). A Factorial Study of Testsin The Perceptual Area (Psychometrika Monograph No. 8). Richmond, VA: Psychometric Corporation.



• Lord, F. (1952). A Theory of Test Scores (Psychometrika Monograph No. 7). Richmond, VA: Psychometric Corporation.



• Degan, J. W. (1952). Dimensions of Functional Psycnosis (Psychometrika Monograph No. 6). Richmond, VA: Psychometric Corporation.