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R Programming
Basic R Programming Interview
Quiz 1
Solution
Q.1.
__________ is used when you have variables that form rows instead of columns.
a) tidy()
b) spread()
c) separate()
d) gather()
Q.2.
Point out the correct statement?
a) tidyr and dplyr packages do not make use of the pipe operator
b) tidyr does less than reshape2
c) tidyr provides ability to string multiple functions together by incorporating %
d) tidyr does greater than reshape2
Q.3.
Which of the following merges two variables into one?
a) spread()
b) gather()
c) separate()
d) unite()
Q.4.
How many functions exist for wrangling the data with dplyr package?
a) one
b) seven
c) three
d) five
Q.5.
Point out the correct statement?
a) gather() makes “long” data wider
b) tidyr is a reframing of reshape designed to accompany the tidy data framework
c) there are two fundamental verbs of data tidying
d) tidyr and dplyr packages do not make use of the pipe operator
Q.6.
________ add new variables/columns or transform existing variables.
a) mutate
b) add
c) apped
d) arrange
Q.7.
_________ extract a subset of rows from a data frame based on logical conditions.
a) rename
b) filter
c) set
d) subset
Q.8.
Spread function is known as ___________ in spreadsheets.
a) pivot
b) unpivot
c) cast
d) order
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