Interview question based on skill :
Take as many assements as you can to improve your validate your skill rating
Total Questions: 20
1. Point out the correct statement :
Correct Answer is : All of the mentioned
2. Which of the following is complementary to tidyr ?
Correct Answer is : dplyr
3. How many functions exist for tidying the data ?
Correct Answer is : three
4. Point out the correct statement :
Correct Answer is : separate() makes “wide” data longer
5. Which of the following function takes multiple columns ?
Correct Answer is : gather()
6. __________ uses regex groups instead of a splitting pattern or position.
Correct Answer is : separate()
7. Which of the following function works similar to separate() ?
Correct Answer is : extract()
8. Which of the following d takes two columns and spreads them in to multiple columns ?
Correct Answer is : print.ggplot
9. Spread function is known as ___________ in spreadsheets.
Correct Answer is : unpivot
10. __________ is used when you have variables that form rows instead of columns.
Correct Answer is : spread()
11. Point out the correct statement :
Correct Answer is : tidyr does less than reshape2
12. Which of the following merges two variables into one ?
Correct Answer is : gather()
13. How many functions exist for wrangling the data with dplyr package ?
Correct Answer is : seven
14. Point out the correct statement :
Correct Answer is : there are two fundamental verbs of data tidying
15. ________ function is similar to the existing subset() function in R
Correct Answer is : filter
16. The ______ operator allows you to string operations in a left-to-right fashion
Correct Answer is : %>%
17. ________ add new variables/columns or transform existing variables
Correct Answer is : mutate
18. _________ extract a subset of rows from a data frame based on logical conditions.
Correct Answer is : rename
19. dplyr can be integrated with the ________ package for large fast tables
Correct Answer is : data.table
20. _________ is an indication that a fatal problem has occurred and execution of the function stops
Correct Answer is : error
