The occurrence of an increase in correlation by restriction of range |
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Authors: | Joseph Levin |
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Institution: | (1) Tel-Aviv University, Israel |
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Abstract: | Given three variables,x, y, z, univariate selection onx, usually reduces the correlationr
y z
. However, in some cases, whenr
x y
orr
x z
assumes extreme values,r
y z
may increase. This reversal is explained by comparison to the effects of suppressor variables and predictors of predictability. |
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Keywords: | |
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