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 |