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Q:

Which of the following offsets, do we use in case of least square line fit? Suppose horizontal axis is independent variable and vertical axis is dependent variable.

 

A. Vertical offset

B. Perpendicular offset

C. Both but depend on situation

D. None of above

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Solution: A

We always consider residual as vertical offsets. Perpendicular offset are useful in case of PCA.

 

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