Data Visualisation

Question 1

What are the 3 main types of data?

Answer 1

• Cross-sectional data
• Time series data
• Panel/Longitudinal data

Question 2

Describe 3 main features of Cross-sectional data

Answer 2

• Contains information on different units of observation that were collected at one point in time
• Notation has i as a subscript referring to units of observation
• Variables in columns, observations in rows

Question 3

Describe 4 main features of Time series data

Answer 3

• Contain information on one unit repetitively observed over time
• Notation has t as subscript referring to units of observation
• Variables in columns time periods in rows
• Order of information affects results

Question 4

Describe 4 main features of Panel/Longitudinal data

Answer 4

• Contain information on several units repetitively observed over time
• Notation has an i subscript for the individual unit of observation and a t subscript for the different times at which the unit is observed
• Variables as columns, observations and time periods as rows
• Order of information affects results

Question 5

What are the 3 basic principles of data visualisation?

Answer 5

• Show the data
• Reduce the clutter
• Integrate the text and graph

Question 6

What are the 2 types of graph you should always avoid?

Answer 6

• 3d charts

- Pie charts

Question 7

What is a cartogram?

Answer 7

Size of each ‘region’ distorted to represent population size