Give examples of bad and good visualizations

 Give examples of bad and good visualizations



Bad visualization:
- Pie charts: difficult to make comparisons between items when area is used, especially when there are lots of items
- Color choice for classes: abundant use of red, orange and blue. Readers can think that the colors could mean good (blue) versus bad (orange and red) whereas these are just associated with a specific segment
- 3D charts: can distort perception and therefore skew data
- Using a solid line in a line chart: dashed and dotted lines can be distracting

Good visualization:
- Heat map with a single color: some colors stand out more than others, giving more weight to that data. A single color with varying shades show the intensity better
- Adding a trend line (regression line) to a scatter plot help the reader highlighting trends

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