Week 1

Coupland (2016) advises that when using graphs, tables and charts to support an argument or make a case, it is very important to be sure that all basic errors must be avoided; and  knowing [skills and knowledge] of how to be critical in evaluating graphical evidence is required. 

In terms of making good visualisation, Coupland (2016) indicates the importance of effectively making features for visual display of data such as the focus on design for audience,  the accurate represent the data, and keeping the display clear is carefully targeted.  

In the design for the audience, it needs to organise the information for emphasising what you are trying to say to the audience.

Which graph when? 

Line Graph

Used for measurements or counts which vary over time: A Time Series Example from 

Column Graph

Column Graph (vertical bar chart) is useful for data that is in categories.

Categories can be grouped for comparison overtime

Bar charts can be horizontal, and side by side

Practical Tips from Dr. Mary Coupland

1-Limit the number of categories shown in a visualisation – be selective in what you present and emphasise the key message/s

2-Show the zero on the vertical axis

3-Line charts are not suitable if there are only two or three data points – use a bar chart instead

For example, if you only have data for two or three years, a line chart may give the impression of a trend.

4-Be aware of the effect of area – a circle with double the radius has four times the area

• • Avoid three dimensional effects – a box with double the length has eight times the volume

  • 3D effects in Excel charts may be misleading

  • Use colour to highlight but be aware of the contrast – avoid patterns in fillings and backgrounds

5-Avoid a wide spread of colours when using colour to indicate changes in a physical quantity

Useful Links:

   Bar charts  vs Column charts  Bar charts  

Others: 1  2  3  4  5