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Which of the following show residuals divided by their standard deviations?

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Which of the following show residuals divided by their standard deviations?

(a) rstudent

(b) cooks.distance

(c) rstandard

(d) all of the mentioned

I had been asked this question in exam.

This intriguing question originated from Residual Variation and Multivariate in chapter Statistical Inference and Regression Models of Data Science

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Best answer
The correct choice is (c) rstandard

To explain: rstandard stands for standardized residuals.

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