4 Major Data Type

• Nominal: Categorical Data, No Ordering

  Example- Pet: {Dog, Cat, Rabbit}

  Operation : = ≠

• Ordinal: Categorical Data, with Ordering

  Example- Rating: {1,2,3,4,5}

  Operation : = ≠, ≺, ≻, ≤, ≥

• Interval: Numerical data, Zero has no fixed meaning

  Example- Temperature, Fahrenheit

  Operation : = ≠, ≺, ≻, ≤, ≥, +, -

• Interval: Numerical data, Zero has special meaning

  Example- Temperature, Kelvin(absolute Zero)

  Operation : = ≠, ≺, ≻, ≤, ≥, +, -, ÷

Visualization Types

• 1D: bar chart, pie chart, histogram
• 2D: scatter plot, line plot, box and whisker plot, heatmap
• 3D+: Scatter matrix, bubble chart

Key Differentiation

Interval data. We care more about differences

Ratio data. We care more about ratios