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The Stata Journal
Volume 5 Number 2: pp. 208-223

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Data inspection using biplots

Ulrich Kohler
Wissenschaftszentrum Berlin
Magdalena Luniak
Wissenschaftszentrum Berlin
Abstract.   Biplots display interunit distances, as well as variances and correla- tions of variables of large datasets. They can be used as a tool to reveal clustering, multicollinearity, and multivariate outliers, and to guide the interpretation of prin- cipal component analyses (PCA). This article describes the uses of biplots and its implementation in Stata.
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