R interview questions part 18
R interview questions part 18
Take as many assements as you can to improve your validate your skill rating
Total Questions: 20
1. If the programmers want the output to be a data frame or a vector, then ________ function is used.
Correct Answer is : Lapply
2. If a programmer wants the output to be a list then ___________ function is used.
Correct Answer is : Sapply
3. _____________ function is preferred over sapply as vapply allows the programmer to specific the output type.
Correct Answer is : Vapply
4. Which function is difficult to implement?
Correct Answer is : Vapply
5. Which function is more verbose?
Correct Answer is : Vapply
6. _____________ will produce a sequential vector c( (1,2,3,4,5,6,7,8,9)).
Correct Answer is : Seq(9)
7. __________ function is used for reading the .csv file in R language.
Correct Answer is : Read.csv ()
8. The line of code in R language should begin with a ________________
Correct Answer is : Hash symbol
9. _______________ returns TRUE then X can be termed as a matrix data object.
Correct Answer is : is.matrix(X)
10. If two vectors with different lengths perform some operation, the elements of the shorter vector will be used again to complete the operation. This is referred to as _________________
Correct Answer is : Element Recycling
11. If the function in a console is.matrix(X) returns true then X can be considered as a _______
Correct Answer is : Matrix data object
12. ______________ measures the probability of the binary response variable in R language.
Correct Answer is : Logical Regression
13. ______________ function will measure the probability of the binary response variable in R language.
Correct Answer is : Glm()
14. ____________ function can be used to select the random sample of size ‘n’ from a huge dataset.
Correct Answer is : Sample()
15. Which function is used to select variables and observations from a given dataset?
Correct Answer is : Subset()
16. ____________ package in R language provides various options for re-randomization and permutations based on statistical tests.
Correct Answer is : Coin
17. A matrix of scatterplots can be produced using _________ function.
Correct Answer is : Pairs
18. __________ function takes various parameters like formula, data, subset, labels, etc.
Correct Answer is : Pairs
19. How will you check if an element is present in a vector?
Correct Answer is : Match()
20. ________ function is usually used inside another function and throws a warning whenever a particular package is not found.
Correct Answer is : Require
