1.1. What is Data?

1.1.1. NOIR

1.1.2. Nominal

  • No distance

  • No quantities

  • Cannot order

1.1.2.1. Can calculate

  • Mode

1.1.2.2. Cannot calculate

  • Mean

1.1.2.3. Examples

  • Colors

  • Weather

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

1.1.3. Ordinal

  • Has order

  • Has numerical value

1.1.3.1. Can calculate

  • Mode - most common value

  • Median

1.1.3.2. Cannot calculate

  • Distance between things

1.1.3.3. 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)

1.1.4. Interval

  • Have order

  • Have distance

  • Has scale

  • Has start

  • Has end

  • No absolute zero on the scale

1.1.4.1. Can Calculate

  • mode

  • median

  • mean

  • minimum

  • maximum

1.1.4.2. 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

1.1.5. Ratio

  • Has order, distance

1.1.5.1. Can Calculate

  • mode

  • median

  • mean

  • minimum

  • maximum

  • T-test

1.1.5.2. Examples

  • Kelvin temperature

  • Wind

  • Number of children