STAT 2: Basic R Definitions

Question 1

Define workspace/working environment

Answer 1

• the current R working environment, including any user-defined objects (vectors, matrices, data frames, functions, lists)
• anything you create during an R session

Question 2

Define objects

Answer 2

• a container for data values, where they may be stored and later retrieved
• in R, all types of data are treated as objects

Question 3

Define packages

Answer 3

• R packages are collections of functions and data sets developed by the community

Question 4

Define a function

Answer 4

• an object in R
• the R interpreter is able to pass control to the function
• syntax in picture

Question 5

Define argument

Answer 5

• named when you define a function

Question 6

What is a directory

Answer 6

• a system of folders that files are organised into

Question 7

What is a data frame?

Answer 7

• a table or other structure where each column contains values of one variable and each row contains one set of values from each column
• can be numerical or categorical

Question 8

What is a vector?

Answer 8

• a sequence of data elements of the same basic type
• members in a vector are called components
• e.g. c(2,3,5) is a vector containing 3 numeric values: 2,3,5

Question 9

Define working directory

Answer 9

• where the current R session accesses files and saves data to

Question 10

What is an R notebook?

Answer 10

• independent executes codes
• makes attractive outputs in a user-friendly way