Six political survey items, N = 119, and unidensional.
This is a covariance matrix that comes De Leeuw (1983) and represents six political survey items. These items are based on N = 119 members of parliament and are supposed to measure the same trait and be unidensional.
Ten Berge, J. M., & Socan, G. (2004). The greatest lower bound to the reliability of a test and the hypothesis of unidimensionality. Psychometrika, 69(4), 613-625.
De Leeuw, J. (1983). Models and methods for the analysis of correlation coefficients. Journal of Econometrics, 22, 113-137.
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