Data visualisation with ggplot2
Data visualization
Important aspect in data sciences -> Communicate information clearly and efficiently to the community.
Powerful tool to discovers patterns in the data.
It makes complex data more accessible -> reveal data.
Bad graphics can be a reason for paper rejection!
- A picture is worth a thousand words.
- Always, always, always plot the data!
- When possible, replace tables with figures that are more compelling.
What is a good graph?
Data-ink ratio
The data-ink ratio is the proportion of ink that is used to present actual data compared to the total amount of ink used in the entire display.
\[ \verb|data-ink ratio| = \frac{\verb|Data-ink|}{\verb|Total ink used to print the graphic|} \]
The data-to-ink ratio should be keep as high as possible.
Examples
Examples
How to lie with graphs
It is easy to exaggerate effects or distort the reality with graphs.