str

Usage

Used to show the structure of a dataframe. The following information is reported:

  • The number of rows (observations)
  • The number of columns (variables)
  • For each variable:
    • The name of the variable
    • The data type of the variable
    • The first few rows of the variable

Usage:

str(dataframe)
  • The input should be a dataframe.
  • We usually don’t store the output, and display it to console instead.

Example 

rm(list=ls())

df <- read.csv("IPUMS_ACS2019_CA_1.csv")

str(df)