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 |
Common variables are not used to apply transforms
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 |
gsub is used for fixing character vectors
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 |
Variables with character values should be made less descriptive
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 |