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Which of the following determine the least-squares regression line?

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Which of the following determine the least-squares regression line? (a) histo() (b) lm (c) barlm() (d) col.max(x) I got this question during an interview for a job. My question is taken from Visualizing Data topic in portion Commands, Packages, Visualizing Data and Linear Regression of R Programming Select the correct answer from above options

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Right option is (b) lm For explanation I would say: lm calls the lower level functions lm.fit.

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