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In a multiple regression y = β0 + β1x1 + β2x2 + β3x3, if based on...

In a multiple regression y = β0 + β1x1 + β2x2 + β3x3, if based on the sample data, the correlation coefficient between x1 and x3 is -0.8, is it going to cause multicollinearity? If so, how do we deal with it?

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