2.1. What is Data?

2.1.1. NOIR

2.1.2. Nominal

  • No distance

  • No quantities

  • Cannot order

2.1.3. Can calculate

  • Mode

2.1.4. Cannot calculate

  • Mean

2.1.5. Examples

  • Colors

  • Weather

  • Player numbers in football (cannot order, or cannot say that player 8 is better than 11)

2.1.6. Ordinal

  • Has order

  • Has numerical value

2.1.7. Can calculate

  • Mode - most common value

  • Median

2.1.8. Cannot calculate

  • Distance between things

2.1.9. Examples

  • Runners at the finish (they have oder, but position doesn't say about the distance)

  • Humidity

  • Rating system (5 stars movie is better than 4 stars, but there is no information how much better)

2.1.10. Interval

  • Have order

  • Have distance

  • Has scale

  • Has start

  • Has end

  • No absolute zero on the scale

2.1.11. Can Calculate

  • mode

  • median

  • mean

  • minimum

  • maximum

2.1.12. Examples

  • Temperature C or F (zero is just a normal number, not a start or end of a scale)

  • pH (pH zero is not a

  • Dates

2.1.13. Ratio

  • Has order, distance

2.1.14. Can Calculate

  • mode

  • median

  • mean

  • minimum

  • maximum

  • T-test

2.1.15. Examples

  • Kelvin temperature

  • Wind

  • Number of children