Implement draw_quantiles like in geom_violin

[adrfantini]

Title says it all, really. It'd be nice to be able to draw vertical quantiles, just like the quantiles that can be drawn by ggplot's geom_violin() using the option draw_quantiles

[clauswilke]

I'll probably have to add this feature at some point. It's frequently requested. In the meantime, note that you can color by quantiles. (Transparency is tricky in this case and needs to be specified in the hex codes for the colors).

ggplot(iris, aes(x=Sepal.Length, y=Species, fill=factor(..quantile..))) +
    geom_density_ridges_gradient(calc_ecdf = TRUE, quantiles = c(0.05, 0.95)) +
    scale_fill_manual(name = "Probability\nranges",
                      values = c("#FF0000A0", "#A0A0A0A0", "#0000FFA0")) +
    theme_ridges() + scale_y_discrete(expand = c(0.01, 0))

[adrfantini]

Oooh, this is nice. Could this be added to the examples vignette and/or to the manual? This can definitely be extremely useful.

[clauswilke]

It's in the documentation for stat_density_ridges() but probably needs to be featured more prominently or in a different location.

[clauswilke]

Drawing quantile lines is now possible.

ggplot(iris, aes(x=Sepal.Length, y=Species)) +
  geom_density_ridges(quantile_lines = TRUE, quantiles = c(0.25, 0.5, 0.75)) +
  scale_y_discrete(expand = c(0.01, 0)) +
  theme_ridges(grid = FALSE, center = TRUE)

[adrfantini]

Thanks for the excellent work.

Adriano Fantini

2017-11-18 22:37 GMT+01:00 Claus Wilke notifications@github.com:

Closed #9 https://github.com/clauswilke/ggridges/issues/9.

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