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Which of the following adds marginal sums to an existing table?

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Which of the following adds marginal sums to an existing table?

(a) par()

(b) prop.table()

(c) addmargins()

(d) quantile()

This question was addressed to me in an international level competition.

My question is from Visualizing Data in portion Commands, Packages, Visualizing Data and Linear Regression of R Programming

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The correct option is (b) prop.table()

The explanation: prop.table() computes proportions from a contingency table.

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