Data Manipulation MCQ part-5

Que.Which of the following function is used for quantiles of quantitative values?
a. quantile
b. quantity
c. quantiles
d. all of the mentioned
Que.Which of the following function is used for determining missing values?
a. any
b. all
c. is
d. all of the mentioned
Que.Point out the wrong statement.
a. Common variables are used to create missingness vector
b. Common variables are used to cutting up quantitative variables
c. Common variables are not used to apply transforms
d. All of the mentioned
Que.Which of the following transforms can be performed with data value?
a. log2
b. cos
c. log10
d. all of the mentioned
Que.Each observation forms a column in tidy data.
a. True
b. False
c. May be True or False
d. Can’t say
Que.Which of the following function is used for casting data frames?
a. dcast
b. ucast
c. rcast
d. all of the mentioned
Que.Which of the following join is by default used in plyr package?
a. left
b. right
c. full
d. all of the mentioned
Que.mutate function is used for casting as multi dimensional arrays.
a. True
b. False
c. May be True or False
d. Can’t say
Que.Which of the following function is good for the automatic splitting of names?
a. split
b. strsplit
c. autsplit
d. none of the mentioned
Que.Point out the correct statement.
a. gsub is used for fixing character vectors
b. sub is used for finding values like grep
c. grep is used for fixing character vectors
d. none of the mentioned
Que.Which of the following function is used for fixing character vectors?
a. tolower
b. toUPPER
c. toLOWER
d. all of the mentioned
Que.Which of the following metacharacter is used to refer to any character?
a. %
b. @
c. .
d. All of the mentioned
Que.Point out the wrong statement.
a. Variables with character values should be made less descriptive
b. Variables with character values should usually be made into factor variable
c. Common variables are used to apply transforms
d. All of the mentioned
Que.Which of the following is used for specifying character class with metacharacter?
a. []
b. {}
c. /+
d. All of the mentioned
Que.Regular expressions can be thought of as a combination of literals and metacharacters.
a. True
b. False
c. May be True or False
d. Can’t say
Que.Which of the following signs are used to indicate repetition?
a. #
b. *
c. –
d. All of the mentioned
Que.Which of the following function is used for searching text strings by means of regular expression?
a. grepd
b. grepl
c. gepexpr
d. all of the mentioned
Que.merge function is used for merging data frames.
a. True
b. False
c. May be True or False
d. Can’t say

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