91. Which of the following function is used for casting data frames?
92. Extracting XML is the basis for most web scraping.
93. Which of the following join is by default used in plyr package?
94. Which of the following package is used for reading JSON data?
95. Which of the following is another name for raw data?
96. Which of the following metacharacter is used to refer to any character?
97. Which of the following function is used for determining missing values?
98. Which of the following is a trait of tidy data?
99. Point out the wrong statement.
100. Which of the following transforms can be performed with data value?
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