Which of the following finds row sums for each level of a grouping variable?(a) rowSums (x, na.rm = FALSE, dims = 1)(b) colMeans(x, na.rm = FALSE, dims = 1)(c) rowMeans(x, na.rm = FALSE, dims = 1)(d) rowsum(x, group, reorder = TRUE, …)The question was posed to me during a job interview.My enquiry is from Commands in chapter Commands, Packages, Visualizing Data and Linear Regression of R Programming

Which of the following finds row sums for each level of a grouping var

1.	Which of the following finds row sums for each level of a grouping variable?(a) rowSums (x, na.rm = FALSE, dims = 1)(b) colMeans(x, na.rm = FALSE, dims = 1)(c) rowMeans(x, na.rm = FALSE, dims = 1)(d) rowsum(x, group, reorder = TRUE, …)The question was posed to me during a job interview.My enquiry is from Commands in chapter Commands, Packages, Visualizing Data and Linear Regression of R Programming
Answer» The correct ANSWER is (c) rowMeans(X, na.rm = FALSE, dims = 1) The EXPLANATION is: False value leads to unexpected result.

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