MCQOPTIONS
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MCQOPTIONS
This section includes 7 Mcqs, each offering curated multiple-choice questions to sharpen your R Programming knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Spread function is known as ___________ in spreadsheets. |
| A. | pivot |
| B. | unpivot |
| C. | cast |
| D. | order |
| Answer» C. cast | |
| 2. |
_________ extract a subset of rows from a data frame based on logical conditions. |
| A. | rename |
| B. | filter |
| C. | set |
| D. | subset |
| Answer» B. filter | |
| 3. |
________ add new variables/columns or transform existing variables. |
| A. | mutate |
| B. | add |
| C. | apped |
| D. | arrange |
| Answer» B. add | |
| 4. |
How many functions exist for wrangling the data with dplyr package? |
| A. | one |
| B. | seven |
| C. | three |
| D. | five |
| Answer» C. three | |
| 5. |
Which of the following merges two variables into one? |
| A. | spread() |
| B. | gather() |
| C. | separate() |
| D. | unite() |
| Answer» C. separate() | |
| 6. |
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 |
| Answer» C. tidyr provides ability to string multiple functions together by incorporating % | |
| 7. |
__________ is used when you have variables that form rows instead of columns. |
| A. | tidy() |
| B. | spread() |
| C. | separate() |
| D. | gather() |
| Answer» C. separate() | |