A data frame represents a set of data with a number of rows and columns. It looks like a matrix but its columns are not necessarily of the same type. This is consistent with the most commonly seen formats of datasets: each row, or data record, is described by multiple columns of various types.
The following table is an example that can be fully characterized by a data frame.
|
Name |
Gender |
Age |
Major |
|
Ken |
Male |
24 |
Finance |
|
Ashley |
Female |
25 |
Statistics |
|
Jennifer |
Female |
23 |
Computer Science |
To create a data frame, we can call data.frame() and supply the data of each column by a vector of the corresponding type:
persons <- data.frame(Name = c("Ken", "Ashley", "Jennifer"),
Gender = c("Male", "Female", "Female"),
Age = c(24, 25, 23),
Major = c("Finance", "Statistics", "Computer Science"))
persons
## Name Gender Age Major
## 1 Ken Male 24 Finance
## 2 Ashley Female 25 Statistics
## 3 Jennifer Female 23 Computer Science...
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