10.2 Overall Vocabulary

  • variable: a quantity, quality, or property that you can measure.
  • value: the state of a variable when you measure it. Can change.
  • observation: a set of measurements made under similar conditions. One value per variable.
  • tabular data: observations of variables.
  • tidy data: 1 observation per row, 1 variable per column, 1 value per cell. Definition of “tidy” for a dataset can depend on what you’re trying to answer.