**Top 100 R programming interview question and answers**

I will introduce you Top 100+ most frequently asked R programming interview question and answers. It is the one-stop resource from where you can boost your interview preparation.If you are aspiring to start your career in the R programming language, then you must know the Frequently Asked Questions in any R programming Interview to help you out, we have gathered a list of R programming interview questions. Mastering these questions would help you in cracking the R programming Interview at a very first attempt. Let’s jump into the question and answer part.

**1. What is R?**

**2. Explain the data import in R language.**

**3. How to communicate the outputs of data analysis using R language.**

**4. How R commands are written?**

**5. What is t-tests () in R?**

**6. What are the disadvantages of R Programming?**

**7. Explain what is the use of With () and By () function in R?**

**8. In R programming, how missing values are represented?**

**9. What is the use of subset() and sample() function in R?**

**10. Explain what is transpose.**

**11. What are the advantages of R?**

**12. Which is the function used for adding datasets in R?**

**13. How you can produce co-relations and covariances?**

**14. What is difference between matrix and dataframes?**

**15. What is difference between lapply and sapply?**

**16. What is the difference between seq(4) and seq_along(4)?**

**17. How can you start the R commander GUI. Explain?**

**18. What is the memory limit of R?**

**19. How many data structures R has?**

**20. Explain how data is aggregated in R.**

**21. How many sorting algorithms are available?**

**22. Explain how to create new variable in R programming?**

**23. What are R packages?**

**24. What is the workspace in R?**

**25. What is the function which is used for merging of data frames horizontally in R?**

**26. what is the function which is used for merging of data frames vertically in R?**

**27. What is the power analysis?**

**28. What package is used for power analysis in R?**

**29. Which method is used for exporting the data in R?**

**30. Which packages are used for exporting of data?**

**31. How impossible values are represented in R?**

**32. Which command is used for storing R object into a file?**

**33. Which command is used for restoring R object from a file?**

**34. What is the use of coin package in R?**

**35. Which function is used for sorting in R?**

**36. What is the use of tapply?**

**37. When the application object does not handle an event, and then happens?**

**38. In what way app specific objects store the app contents.**

**39. Explain the purpose of using UIWindow object?**

**40. Tell me the super class of all view controller objects.**

**41. How to create axes in the graph?**

**42. What is the use of abline() function?**

**43. Why vcd package is used?**

**44. What is GGobi?**

**45. What is iPlots?**

**46. What is the use of lattice package?**

**47. What is fitdistr() function?**

**48. Which data structures are used to perform statistical analysis and create graphs.**

**49. What is the use of sink() function?**

**50. Why library() function is used?**

**51. Why search() function is used?**

**52. On which type of data binary operators are worked?**

**53. What is the use of doBY package?**

**54. Which function is used to create frequency table?**

**55. Define loglm() function.**

**56. What is the use of corrgram() function?**

**57. How to create scatterplot matrices?**

**58. What is the use of diagnostic plots?**

**59. Define anova() function.**

**60. What is cv.lm() function?**

**61. Define leaps().**

**62. Define relaimpo package.**

**63. Why car package is used?**

**64. Define robust package.**

**65. What is robustbase?**

**66. Define plotmeans().**

**67. What is the full form of MANOVA?**

**68. What is the use of MANOVA?**

**69. Define mshapiro.test( ).**

**70.Define barlett.test().**

**71. What is fligner.test()?**

**72. Define hovplot().**

**73. Which variables are represented by lower case letters?**

**74. Which variables are represented by upper case letters?**

**75. What is logistic regression?**

**76. Define Poison regression.**

**77. Define Survival analysis.**

**78. What is the use survfit() function?**

**79. Define survdiff().**

**80. What is coxph()?**

**81. In which package survival analysis is defined?**

**82. What is the use of MASS package?**

**83. Define qda().**

**84. Define lda().**

**85. What is the use of forecast package?**

**86. Define auto.arima().**

**87. What is principal() function?**

**88. What is FactoMineR?**

**89. What is the full form of CFA?**

**90. What is the use of boot.sem() function?**

**91. What is the full form of SEM?**

**92. Which function performs classical multidimensional scaling?**

**93. Define isoMDS().**

**94. Which function perform individual difference scaling?**

**95. What is pvclust() function ?**

**96. Define cluster.stats() ?**

**97. What we use party package?**

**98. Which package provide the bootstrapping?**

**99. Define MATLAB package.**

**100. What is the use of Matrix package?**