Recent questions and answers in Data Handling

+1 vote

75 views

Which of the following functions does not list the total number of observations in a dataset?

answered 3 days ago in Data Handling by anonymous

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81 views

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?

answered Jan 16 in Data Handling by anonymous

+1 vote

57 views

In the hflights dataset, how many flights were cancelled in the month of January 2011

answered Jan 16 in Data Handling by anonymous

0 votes

47 views

The function read.csv() imports data into

answered Nov 20, 2019 in Data Handling by anonymous

0 votes

32 views

Applying lapply function on a matrix returns

answered Nov 7, 2019 in Data Handling by anonymous

+1 vote

78 views

If x and y are two tbls, which of the following joins return all rows from x and y irrespective of matching values?

answered Oct 29, 2019 in Data Handling by anonymous

+1 vote

41 views

Which of the following functions lists all columns in a dataset with few values from each column?

answered Oct 12, 2019 in Data Handling by anonymous

+1 vote

40 views

Which of the following functions can be used to find the number or rows and columns in a dataset?

answered Oct 11, 2019 in Data Handling by anonymous

0 votes

44 views

Which function is used over the margins of an array

answered Sep 28, 2019 in Data Handling by anonymous

+1 vote

54 views

dplyr never prints row names since no dplyr method is guaranteed to preserve them.

answered Sep 26, 2019 in Data Handling by anonymous

0 votes

9 views

asked Sep 3, 2019 in Data Handling by Robin (1k points)

+1 vote

41 views

In the mtcars dataset, how many cars provide a mileage of less than 20 mpg?

answered May 27, 2019 in Data Handling by tempuser (201 points)

+1 vote

37 views

In the iris dataset, how many flowers havePetal.Length/Petal.Width ratio of less than 10

answered May 27, 2019 in Data Handling by tempuser (201 points)

+1 vote

220 views

In the iris dataset, how many flowers of species setosa havePetal.Length/Petal.Width ratio of less than 10.

answered May 27, 2019 in Data Handling by tempuser (201 points)

+1 vote

40 views

What is the average mileage of a car in the mtcars dataset

answered May 27, 2019 in Data Handling by tempuser (201 points)

+1 vote

27 views

dplyr is useful for:

answered May 27, 2019 in Data Handling by tempuser (201 points)

0 votes

31 views

tbl is an extension of:

answered May 27, 2019 in Data Handling by tempuser (201 points)

+1 vote

42 views

Which command can be used to import text files in R

answered May 27, 2019 in Data Handling by tempuser (201 points)

+1 vote

37 views

nrows and skip arguments in the read.table() command can be used to get

answered May 27, 2019 in Data Handling by tempuser (201 points)

+1 vote

47 views

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?

answered May 27, 2019 in Data Handling by tempuser (201 points)

0 votes

28 views

Which package is used to import data from a SQL server to R?

answered May 27, 2019 in Data Handling by tempuser (201 points)

0 votes

40 views

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)

answered May 27, 2019 in Data Handling by tempuser (201 points)

0 votes

62 views

What will the following lines of code return x <- matrix(1:18, 6, 3) apply(x, 2, sum)

answered May 27, 2019 in Data Handling by tempuser (201 points)

0 votes

18 views

Which function is very similar to lapply?

answered May 27, 2019 in Data Handling by tempuser (201 points)

0 votes

36 views

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?

answered May 27, 2019 in Data Handling by tempuser (201 points)

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