Streamgraph with R
A streamgraph is a variation of a stacked area chart. Instead of displaying values on top of a fixed, straight baseline at the bottom of the stack, the values of the streamgraph are displaced around a central baseline.
More about: Streamgraph
Streamgraph using ggstream
package
# Loading required packages
library(unhcrthemes)
library(tidyverse)
library(scales)
library(ggstream)
# Loading data
df <- read_csv("https://raw.githubusercontent.com/GDS-ODSSS/unhcr-dataviz-platform/master/data/change_over_time/streamgraph.csv")
# Plot
ggplot(
df,
aes(
x = year,
y = population_number,
fill = factor(population_type,
levels = c("REF", "ASY", "IDP", "STA", "OOC", "VDA")
)
)
) +
geom_stream() +
scale_fill_unhcr_d(
palette = "pal_unhcr_poc",
nmax = 9,
order = c(1, 3:5, 8:9),
labels = c("Refugees", "Asylum-seekers", "IDPs", "Stateless persons", "Others of concern", "Venezuelans displaced abroad")
) +
labs(
title = "People of concern to UNHCR | 1991-2021",
y = "Number of people",
caption = "Source: UNHCR Refugee Data Finder\n© UNHCR, The UN Refugee Agency"
) +
scale_x_continuous(breaks = pretty_breaks(n = 8)) +
scale_y_continuous(
labels = label_number_si(),
breaks = pretty_breaks(n = 6)
) +
theme_unhcr(
grid = "XY",
axis_title = "y",
axis = FALSE
)
