Lines to Ratios

The following is a nice example of small multiple with line plots

Figure 1: = Six lines and three colours is difficult to interpret.

Small multiples is a better way to go:

Figure 2: Small multiples.

Putting the 2014 epidemic into context, we can appreciate how much worse they were compared to previous outbreaks:

Figure 3: Historical context.

We can also plot a ratio plot of this data. In this cast the ratio, as a proportion of deadly cases, cannot exceed 1, so we can limit out plot to only the region of possibility.

Figure 4: A Ratio Plot