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Definition
A principal component analysis decomposes the covariance (or correlation) matrix into independent components, which comprise decreasing amounts of variance, reflected by their respective eigenvalues.
Introduction
In psychological research, measurement instruments, such as questionnaires or tests, usually comprise a set of items. Typically, these items are thought to belong together, which is statistically reflected by their covariance. To find the common components in the covariance structure of a set of items, principal components can be mathematically identified through analysis of the covariance matrix of these items. All items receive loadings in each of the components that quantify their respective relationships with them in terms of the amount of variance they share. Even though the analysis of the principal components is not yet a procedure to analyze the assumed latent structure of a hypothetical construct that could be responsible for the covariance of...
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References
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Hilbert, S., Bühner, M. (2020). Principal Components Analysis. In: Zeigler-Hill, V., Shackelford, T.K. (eds) Encyclopedia of Personality and Individual Differences. Springer, Cham. https://doi.org/10.1007/978-3-319-24612-3_1340
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DOI: https://doi.org/10.1007/978-3-319-24612-3_1340
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