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Which of the following builds empirical cumulative distribution function?

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Which of the following builds empirical cumulative distribution function? (a) ecdf() (b) cum (c) cumsum (d) lm() I got this question at a job interview. Query is from Visualizing Data topic in section Commands, Packages, Visualizing Data and Linear Regression of R Programming Select the correct answer from above options

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The correct choice is (a) ecdf() To elaborate: cumsum() is used to produce running total of values for input vector.

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