Replicate visualisations from elsewhere

[llewelld]

There are some visualisations from other sources that it might be interesting to try to replicate, including the new data.

For example:

1. The Dashboard 4 Scatterplot from the DataLytix article.
2. The Figure 3 posterior distribution plots from Blangiardoaand and Bai**

More for experimentation than anything else.

[llewelld]

An attempt at the scatterplot can be found in #16.

[llewelld]

Some experimentation for rendering the posterior distributions plots can be found in #18.