You may remember from the chapter about matrices that all the elements that you put in a matrix should be of the same type. Back then, your data set on Star Wars only contained numeric elements.
When doing a market research survey, however, you often have questions such as:
logical)numeric)character)The output, namely the respondents' answers to the questions formulated above, is a data set of different data types. You will often find yourself working with data sets that contain different data types instead of only one.
A data frame has the variables of a data set as columns and the observations as rows. This will be a familiar concept for those coming from different statistical software packages such as SAS or SPSS.
Click 'Submit Answer'. The data from the built-in example data frame mtcars will be printed to the console.
# Print out built-in R data frame
mtcars
# Print out built-in R data frame
mtcars
test_output_contains("mtcars", incorrect_msg = "Do not change anything about the code, Make sure that you output `mtcars`.")
success_msg("Great! Continue to the next exercise.")
Just click 'Submit Answer' and witness the magic!