R Programming Class Test

3. [, [[ and $ operators
5. The _________ R system contains, among other things, the base package which is required to run R and
7. Individual R objects can be saved to a file using the _____ function.
9. R functionality is divided into a number of ________
12. Numbers in R are generally treated as _______ precision real numbers.
13. Attributes of an object (if any) can be accessed using the ______ function.
15. ________ function is similar to the existing subset() function in R but is quite a bit faster.
17. Which of the following should be preferred for evaluation from list of alternatives ?
19. Collection of objects currently stored in R is called as :
20. function similar to summarize
21. The _________ function can be used to select columns of a data frame that you want to focus on.
22. What would be the output of the following code ? > x <- Sys.time() > class(x)
24. Connections to text files can be created with the ________ function.

1. ________ add new variables/columns or transform existing variables
2. What will the following code print ? >x <- 0:6 >as.logical(x)
4. _________ generate summary statistics of different variables in the data frame, possibly within strata
6. Elementary commands in R consist of either _______ or assignments.
8. Data frames can be converted to a matrix by calling data._______
10. R objects can have attributes, which are like ________ for the object.
11. The most convenient way to use R is at a graphics workstation running a ________ system.
12. The dplyr package can be installed from GitHub using the _______ package
14. _______ is used to break the execution of a loop.
16. base package for R language
18. The entities that R creates and manipulates are known as ________
20. ________ opens a connection to a file compressed with gzip.
23. They primary R system is available from the ______