# Gallery of ggridges examples

#### Claus O. Wilke

#### 2020-01-11

## Evolution of movie lengths over time

Data from the IMDB, as provided in the ggplot2movies package.

    library(ggplot2movies)

    ggplot(movies[movies$year>1912,], aes(x = length, y = year, group = year)) +
      geom_density_ridges(scale = 10, size = 0.25, rel_min_height = 0.03) +
      theme_ridges() +
      scale_x_continuous(limits = c(1, 200), expand = c(0, 0)) +
      scale_y_reverse(
        breaks = c(2000, 1980, 1960, 1940, 1920, 1900),
        expand = c(0, 0)
      ) +
      coord_cartesian(clip = "off")

## Results from Catalan regional elections, 1980-2015

Modified after a figure originally created by Marc Belzunces.

    library(dplyr)
    library(forcats)

    Catalan_elections %>%
      mutate(YearFct = fct_rev(as.factor(Year))) %>%
      ggplot(aes(y = YearFct)) +
      geom_density_ridges(
        aes(x = Percent, fill = paste(YearFct, Option)),
        alpha = .8, color = "white", from = 0, to = 100
      ) +
      labs(
        x = "Vote (%)",
        y = "Election Year",
        title = "Indy vs Unionist vote in Catalan elections",
        subtitle = "Analysis unit: municipalities (n = 949)",
        caption = "Marc Belzunces (@marcbeldata) | Source: Idescat"
      ) +
      scale_y_discrete(expand = c(0, 0)) +
      scale_x_continuous(expand = c(0, 0)) +
      scale_fill_cyclical(
        breaks = c("1980 Indy", "1980 Unionist"),
        labels = c(`1980 Indy` = "Indy", `1980 Unionist` = "Unionist"),
        values = c("#ff0000", "#0000ff", "#ff8080", "#8080ff"),
        name = "Option", guide = "legend"
      ) +
      coord_cartesian(clip = "off") +
      theme_ridges(grid = FALSE)

## Temperatures in Lincoln, Nebraska

Modified from a blog post by Austin Wehrwein.

    ggplot(lincoln_weather, aes(x = `Mean Temperature [F]`, y = Month, fill = stat(x))) +
      geom_density_ridges_gradient(scale = 3, rel_min_height = 0.01, gradient_lwd = 1.) +
      scale_x_continuous(expand = c(0, 0)) +
      scale_y_discrete(expand = expand_scale(mult = c(0.01, 0.25))) +
      scale_fill_viridis_c(name = "Temp. [F]", option = "C") +
      labs(
        title = 'Temperatures in Lincoln NE',
        subtitle = 'Mean temperatures (Fahrenheit) by month for 2016'
      ) +
      theme_ridges(font_size = 13, grid = TRUE) +
      theme(axis.title.y = element_blank())

## Visualization of Poisson random samples with different means

Inspired by a ggridges example by Noam Ross.

    # generate data
    set.seed(1234)
    pois_data <- data.frame(mean = rep(1:5, each = 10))
    pois_data$group <- factor(pois_data$mean, levels = 5:1)
    pois_data$value <- rpois(nrow(pois_data), pois_data$mean)

    # make plot
    ggplot(pois_data, aes(x = value, y = group, group = group)) +
      geom_density_ridges2(aes(fill = group), stat = "binline", binwidth = 1, scale = 0.95) +
      geom_text(
        stat = "bin",
        aes(
          y = group + 0.95*stat(count/max(count)),
          label = ifelse(stat(count) > 0, stat(count), "")
        ),
        vjust = 1.4, size = 3, color = "white", binwidth = 1
      ) +
      scale_x_continuous(
        breaks = c(0:12), limits = c(-.5, 13),
        expand = c(0, 0), name = "random value"
      ) +
      scale_y_discrete(
        expand = expand_scale(add = c(0, 1.)), name = "Poisson mean",
        labels = c("5.0", "4.0", "3.0", "2.0", "1.0")
      ) +
      scale_fill_cyclical(values = c("#0000B0", "#7070D0")) +
      labs(
        title = "Poisson random samples with different means",
        subtitle = "sample size n=10"
      ) +
      guides(y = "none") +
      theme_ridges(grid = FALSE) +
      theme(
        axis.title.x = element_text(hjust = 0.5),
        axis.title.y = element_text(hjust = 0.5)
      )

## Height of Australian athletes

     ggplot(Aus_athletes, aes(x = height, y = sport, color = sex, point_color = sex, fill = sex)) +
      geom_density_ridges(
        jittered_points = TRUE, scale = .95, rel_min_height = .01,
        point_shape = "|", point_size = 3, size = 0.25,
        position = position_points_jitter(height = 0)
      ) +
      scale_y_discrete(expand = c(0, 0)) +
      scale_x_continuous(expand = c(0, 0), name = "height [cm]") +
      scale_fill_manual(values = c("#D55E0050", "#0072B250"), labels = c("female", "male")) +
      scale_color_manual(values = c("#D55E00", "#0072B2"), guide = "none") +
      scale_discrete_manual("point_color", values = c("#D55E00", "#0072B2"), guide = "none") +
      coord_cartesian(clip = "off") +
      guides(fill = guide_legend(
        override.aes = list(
          fill = c("#D55E00A0", "#0072B2A0"),
          color = NA, point_color = NA)
        )
      ) +
      ggtitle("Height in Australian athletes") +
      theme_ridges(center = TRUE)

## A cheese plot

Inspired by this tweet by Leonard Kiefer.

    set.seed(423)
    n1 <- 200
    n2 <- 25
    n3 <- 50
    cols <- c('#F2DB2F', '#F7F19E', '#FBF186')
    cols_dark <- c("#D7C32F", "#DBD68C", "#DFD672")
    cheese <- data.frame(
      cheese = c(rep("buttercheese", n1), rep("Leerdammer", n2), rep("Swiss", n3)),
      x = c(runif(n1), runif(n2), runif(n3)),
      size = c(
        rnorm(n1, mean = .1, sd = .01),
        rnorm(n2, mean = 9, sd = 3),
        rnorm(n3, mean = 3, sd = 1)
      )
    )
    ggplot(cheese, aes(x = x, point_size = size, y = cheese, fill = cheese, color = cheese)) +
      geom_density_ridges(
        jittered_points = TRUE, point_color="white", scale = .8, rel_min_height = .2,
        size = 1.5
      ) +
      scale_y_discrete(expand = c(0, 0)) +
      scale_x_continuous(limits = c(0, 1), expand = c(0, 0), name = "", breaks = NULL) +
      scale_point_size_continuous(range = c(0.01, 10), guide = "none") +
      scale_fill_manual(values = cols, guide = "none") +
      scale_color_manual(values = cols_dark, guide = "none") +
      coord_cartesian(clip = "off") +
      theme_ridges(grid = FALSE, center = TRUE)