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### Does the variable order matter in linear regression [duplicate]

I'm investigating interplay between two variables ($x_1$ and $x_2$). There is a great deal of linear correlation between these variables with $r>0.9$. From the nature of the problem I cannot say ...
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### How can I proot [duplicate]

if R2=0, then the slope estimator of the linear regression of Y to X is equal to the reciprocal of the slope estimator to the linear regression of X to Y
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### Effect of interchanging response and predictor in linear regression [duplicate]

I'm trying to run linear regression models using the R data "Auto.csv", which has the data for miles per gallon and the displacement. Now I'm trying to run two different linear regression ...