Data types and representation Two types of data

  • Slides: 13
Download presentation
Data types and representation Two types of data: Discrete Continuous Observations are a finite,

Data types and representation Two types of data: Discrete Continuous Observations are a finite, countable, number of values Observations can take on any number of the countless number of values in an interval eg. Number of “sixes” after 3 throws of the dice eg. The average IQ of ten random Heads of Department

Data types and representation Types of measurements Nominal Objects are named and assigned to

Data types and representation Types of measurements Nominal Objects are named and assigned to classes eg. male or female Ordinal Objects are either greater, or smaller than, a comparative object eg. finishing positions in a race Ratio level Basic standard interval exists + meaningful zero eg. mass Interval level Basic standard interval is introduced, but no true zero eg. temperature in celsius

Data types and representation Summarising discrete data: Name Eye Colour Janice brown Tom blue

Data types and representation Summarising discrete data: Name Eye Colour Janice brown Tom blue Danielle green Ian brown Eduardo brown Emily brown Anja blue Cara brown Adrian brown Eric blue Sarah brown David brown

Data types and representation Summarising discrete data: Frequency tables Eye Colour Frequency Brown 33

Data types and representation Summarising discrete data: Frequency tables Eye Colour Frequency Brown 33 Blue 14 Green 3

Data types and representation Summarising discrete data: Frequency tables Eye Colour Frequency Relative Frequency

Data types and representation Summarising discrete data: Frequency tables Eye Colour Frequency Relative Frequency Brown 33 66% Blue 14 28% Green 3 6%

Data types and representation Summarising discrete data: Frequency bar graph

Data types and representation Summarising discrete data: Frequency bar graph

Data types and representation Summarising discrete data: Relative frequency bar graph

Data types and representation Summarising discrete data: Relative frequency bar graph

Data types and representation Summarising continuous data: Name Hours of Sleep / Night Janice

Data types and representation Summarising continuous data: Name Hours of Sleep / Night Janice 6 Tom 7. 5 Danielle 10. 5 Ian 9 Eduardo 7 Emily 6 Anja 8 Cara 5 Adrian 8. 5 Eric 6. 5 Sarah 7. 5 David 4

Data types and representation Summarising continuous data: Frequency tables Hours of Sleep Frequency 3

Data types and representation Summarising continuous data: Frequency tables Hours of Sleep Frequency 3 - 4 hrs 1 4 - 5 hrs 3 5 - 6 hrs 6 6 - 7 hrs 14 7 - 8 hrs 16 8 - 9 hrs 5 9 - 10 hrs 3 10 - 11 hrs 2

Data types and representation Summarising continuous data: Frequency bar graph (Histogram)

Data types and representation Summarising continuous data: Frequency bar graph (Histogram)

Data types and representation Summarising continuous data: Relative frequency bar chart

Data types and representation Summarising continuous data: Relative frequency bar chart

Data types and representation Summarising continuous data: Line graph

Data types and representation Summarising continuous data: Line graph

Data types and representation Summarising continuous data: Scatter graph

Data types and representation Summarising continuous data: Scatter graph