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In the mtcars dataset, how many cars provide a mileage of less than 20 mpg?
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May 27, 2019
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In the iris dataset, how many flowers havePetal.Length/Petal.Width ratio of less than 10
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May 27, 2019
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tempuser
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In the iris dataset, how many flowers of species setosa havePetal.Length/Petal.Width ratio of less than 10.
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May 27, 2019
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What is the average mileage of a car in the mtcars dataset
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May 27, 2019
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In the hflights dataset, how many flights were cancelled in the month of January 2011
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May 27, 2019
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tempuser
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Which of the following functions lists all columns in a dataset with few values from each column?
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May 27, 2019
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Which of the following functions does not list the total number of observations in a dataset?
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May 27, 2019
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tempuser
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Which of the following functions can be used to find the number or rows and columns in a dataset?
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May 27, 2019
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tempuser
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dplyr is useful for:
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May 27, 2019
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Data Handling
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tbl is an extension of:
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May 27, 2019
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Which command can be used to import text files in R
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May 27, 2019
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nrows and skip arguments in the read.table() command can be used to get
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May 27, 2019
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The function write.csv() exports data into a file. However, this function by default adds rownames to the file. Which argument can be used to turn off addition of rownames?
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May 27, 2019
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tempuser
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Which package is used to import data from a SQL server to R?
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May 27, 2019
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tempuser
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The function read.csv() imports data into
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May 27, 2019
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For a given matrix mat, how do you increment every element of the matrix by 3 and return a vector. (I) sapply(mat, function(x,y) sum(x)+y,y=3) (II) sapply(mat, function(x) sum(x)+3)
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May 27, 2019
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What will the following lines of code return x <- matrix(1:18, 6, 3) apply(x, 2, sum)
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May 27, 2019
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Which function is used over the margins of an array
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May 27, 2019
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A hospital data contains patient's age and treatment they are undergoing. Which function can be used to find average of patients undergoing each of the treatments?
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May 27, 2019
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Applying lapply function on a matrix returns
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May 27, 2019
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Which function is very similar to lapply?
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May 27, 2019
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tempuser
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Which function can be used when a vector needs to be split into groups defined by a classifying factor, compute a function on the subsets, and return the results?
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May 27, 2019
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Data Handling
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tempuser
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