R Programming Class Test

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Across
  1. 2. base package for R language
  2. 4. The _________ R system contains, among other things, the base package which is required to run R and
  3. 5. Data frames can be converted to a matrix by calling data._______
  4. 7. R objects can have attributes, which are like ________ for the object.
  5. 11. What will the following code print ? >x <- 0:6 >as.logical(x)
  6. 13. Numbers in R are generally treated as _______ precision real numbers.
  7. 15. R functionality is divided into a number of ________
  8. 18. Elementary commands in R consist of either _______ or assignments.
  9. 20. The entities that R creates and manipulates are known as ________
  10. 21. They primary R system is available from the ______
  11. 22. Individual R objects can be saved to a file using the _____ function.
  12. 24. ________ opens a connection to a file compressed with gzip.
  13. 25. Connections to text files can be created with the ________ function.
Down
  1. 1. What would be the output of the following code ? > x <- Sys.time() > class(x)
  2. 3. ________ add new variables/columns or transform existing variables
  3. 4. _______ is used to break the execution of a loop.
  4. 6. The dplyr package can be installed from GitHub using the _______ package
  5. 8. Attributes of an object (if any) can be accessed using the ______ function.
  6. 9. The most convenient way to use R is at a graphics workstation running a ________ system.
  7. 10. function similar to summarize
  8. 12. _________ generate summary statistics of different variables in the data frame, possibly within strata
  9. 14. Which of the following should be preferred for evaluation from list of alternatives ?
  10. 16. Collection of objects currently stored in R is called as :
  11. 17. The _________ function can be used to select columns of a data frame that you want to focus on.
  12. 19. [, [[ and $ operators
  13. 23. ________ function is similar to the existing subset() function in R but is quite a bit faster.