61. . . . . . . . . let's you perform SQL queries on your R data frames.
62. . . . . . . . . splits a data frame and results an array (hence the da). Hopefully you're getting the idea here.
63. . . . . . . . . makes it incredibly easy to fit time series models like ARIMA, ARMA, AR, Exponential Smoothing, etc.
64. . . . . . . . . provides needed string operators in R.
65. Which of the following syntax is used to install forecast package?
66. Which of the following is similar to Moment.js?
67. Which of the following is a library for statistical quality control?
68. . . . . . . . . specializes in converting data from wide to long format.
69. . . . . . . . . is used to convert wide data to long data.
70. . . . . . . . . is used to view all packages installed.
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