Variables

Qualitative (categorical): labels/names identify an attribute of an element

• Nominal scale: order doesn’t matter (think majors)
• Ordinal scale: order does matter (ranked) (think school in year)
  • ways to summarize:

Quantitave (numerical): how much/many

• Interval scale: rations cannot be compared
• Ratio scale: ratios are meaningful (’0’ = 0)
  • ways to summarize: