R Programming Class Test

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