README.md

In javiereliomedina/ggpyramid: Plot population pyramids

ggpyramid

Overview

ggpyramid package provides a function for plotting population pyramids in {ggplot2}

Installation

if (!require("remotes")) install.packages("remotes")
remotes::install_github("javiereliomedina/ggpyramid")

Usage

  library(danstat) 
  library(tidyverse)
  library(ggpyramid)
  library(dint)
  library(forcats)
  library(purrr)

As an example, I have downloaded some data from Statistic Denmark using the R-package danstat.

# Load data from Denmark using (danstat)

  var_pop <- get_table_metadata(table_id = "FOLK1C", variables_only = TRUE)

## Define var_input

  # Codes
  var_codes <- c("OMRÅDE", "KØN", "ALDER", "HERKOMST", "Tid")

  # Values
  ## Region: Denmark
  id_region <- "000"
  ## Gender: Men/Women
  id_gender <- c(1, 2)
  ## Age (remove total)
  id_age <- subset(var_pop$values[[3]], id != "IALT")$id
  ## Ancestry
  id_ancestry <- c(5, 4, 3)
  ## Quarters
  id_quarter <- "2020K4"

  var_values <- list(id_region, id_gender, id_age , id_ancestry, id_quarter)
  var_input <- purrr::map2(.x = var_codes, .y = var_values, .f = ~list(code = .x, values = .y))

## Get data 
  data <- get_data("FOLK1C", variables = var_input) %>%
    #Translate into English 
    rename(region = OMRÅDE,
           gender = KØN,
           age = ALDER,
           ancestry = HERKOMST,
           date = TID, 
           pop = INDHOLD) %>% 
    # Format date
    mutate(date = gsub("Q", "", date),
           date = as_date_yq(as.integer(date)),
           date = first_of_quarter(date)) %>% 
    # Format ancestry 
    mutate(ancestry = ifelse(ancestry == "Persons of Danish origin", "Danish", ancestry),
           ancestry = factor(ancestry), 
           ancestry = fct_relevel(ancestry, "Immigrants", after = 1)) %>% 
    # Format age (consecutive levels)  
    mutate(age = ifelse(age == "100 years and over", "100OV", age),
           age = gsub(" years", "", age),
           age = factor(age, levels = id_age))

We can use the default settings for plotting the population pyramid:

data %>% 
  ggpyramid()

We can also use another variable for changing the fill aesthetic (i.e. ancestry), and use standard ggplot functions for adding additional layers:

data %>% 
  ggpyramid(fill = ancestry) +
  labs(title = "Population pyramith of Denmark",
       caption = "Source: Statistics Denmark") + 
  annotate(geom = "text",
           y = c(100000 , 100000),
           x = 20.5,
           label = "Women",
           fontface = "bold",
           size = 3) +
  annotate(geom = "text",
           y = c(-100000,-100000),
           x = 20.5,
           label = "Men",
           fontface = "bold",
           size = 3)

We can also plot the population in percentage:

  brks_y <- seq(-4, 4, 1)
  lmts_y = c(min(brks_y), max(brks_y))
  lbls_y <- paste0(as.character(abs(brks_y)), "%")

  data %>% 
    mutate(pop_pct = 100 * pop / sum(pop)) %>% 
    ggpyramid(pop = pop_pct, fill = ancestry) +
    scale_fill_manual(name = "Ancestry", values = c("#0072B2", "#F0E442", "#D55E00")) +
    scale_y_continuous(name = NULL, breaks = brks_y, labels = lbls_y, limits = lmts_y) +
    labs(title = "Population pyramith of Denmark",
         caption = "Source: Statistics Denmark") + 
    geom_segment(data = data, aes(x = 4, xend = 4, y = -4, yend = 4), linetype = "dashed") +
    geom_segment(data = data, aes(x = 13.5, xend = 13.5, y = -4, yend = 4), linetype = "dashed") +
    annotate(geom = "text", y = c(2 , 2),  x = 20.5, label = "Women", fontface = "bold", size = 3) +
    annotate(geom = "text", y = c(-2,-2),  x = 20.5, label = "Men", fontface = "bold", size = 3)

Notes

I have created this repository during my work as postdoctoral researcher at Aalborg University, in the project “Global flows of migrants and their impact on north European welfare states - FLOW”.

It is not endorsed by the university or the project, and it is not maintained. All the data I use here are public, and my only aim is that the repository serves for learning R. For more information about migration and the project outcomes please visit the project’s website: https://www.flow.aau.dk.

javiereliomedina/ggpyramid documentation built on Dec. 20, 2021, 9:08 p.m.