I have long struggled to bring kernel density plots into the "mainstream." See Reading kernel distribution plot vs typical histogram. However, I recently came across a report that pulled off the tricky inference vs aesthetics trade-off that can be too one-sided with these types of visuals:
- It has smooth curvature, something we tend to find in kernel density plots
- However, it has a y axis in absolutes, not the decimal intervals we use for taking the interval between two points on the kernel density plot
This leads me to believe it's not a kernel density plot but simply a line representation of the spread.