Data Types

Data can be of different types:

Numeral (quantitative)

  • Discrete (integer; for example counts or date grouped by year)
  • Continuous (real number; for example height as measured. However, if rounded to the nearest cm the data would become discrete)

Categorical (qualitative)

  • Nominal (different groups; for example dome osteotomy and wedge osteotomy)
  • Ordinal (ordered groups; for example bed ridden, walking with frame, walking with sticks, walking unaided)
  • Binary (yes / no ; true / false ; dead / alive)

The appropriate type of statistical analysis depends on the type of data.

What type of plot is appropriate depends mainly on the type of data to be presented.