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Biometrika 1985 72(2):253-265; doi:10.1093/biomet/72.2.253
© 1985 by Biometrika Trust
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Chi-plots for assessing dependence

N. I. FISHER and P. SWITZER

CSIRO, Division of Mathematics & Statistics Lindfield, New South Wales 2070, Australia
Department of Statistics, Stanford University Stanford, California 94305, U.S.A

This paper presents a graphical method to be used, in conjunction with a scatterplot, to investigate possible association of two variates as manifested in a sample of bivariate measurements. The method is designed so that the plot is approximately horizontal under independence, and under various forms of association it produces corresponding characteristic patterns. Examples given include application to study of regression residuals, dependence of two spatial point processes, serial association of time series, and comparison of two time series.

Key Words: Association • Correlation • Graphical method • Nonparametric method • Probability plotting • Regression residual • Test of independence • Time series


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