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Statistical analysis reveals how grouping influences correlation coefficients in census tract data, highlighting implications for data interpretation.
C. E. Gehlke, Katherine Biehl, Certain Effects of Grouping Upon the Size of the Correlation Coefficient in Census Tract Material, Journal of the American Statistical Association, Vol. 29, No. 185, Supplement: Proceedings of the American Statistical Journal (Mar., 1934), pp. 169-170
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Gehlke et al. (1934) studied this question.
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