West Indian Ancestry in Brooklyn

Mapping the proportion of people with West Indian ancestry in Brooklyn, New York.

library(tidyverse)
library(tidycensus)
library(sf)
library(scales)
library(RColorBrewer)
library(plotly)

Methods

Borough boundaries are represented with a shapefile that was downloaded from NYC Open Data.

Census tract boundaries and data are from the 2016-2020 5-year American Community Survey, accessed with the tidyverse R package. Census data includes:

• the number of people with West Indian ancestry
• total population that reports ancestry

The proportion of people with West Indian ancestry for each census tract was calculated and the census tracts with no residents were removed.

boros <- st_read("part2/data/raw/geo/BoroughBoundaries.geojson")

raw_ancestry <- get_acs(geography = "tract", 
                        variables = c(ancestry_pop = "B04006_001",
                                      west_indian = "B04006_094"), 
                        state='NY',
                        county = 'Kings',
                        geometry = T, 
                        year = 2020,
                        output = "wide") 

west_indian <- raw_ancestry |> 
  mutate(pct_west_indian = west_indianE/ancestry_popE) |> 
  filter(ancestry_popE > 0)

Results

west_indian_map <- ggplot()  + 
  geom_sf(data = west_indian, 
          mapping = aes(fill = pct_west_indian,
                        text = paste0(NAME, ":",
                                      "<br>Percent West Indian ancestry: ",
                                      percent(pct_west_indian, accuracy=1))),
          color = "transparent") +
  theme_minimal() +
  theme(panel.grid.major = element_line(colour = "transparent"),
        axis.text.x = element_blank(),
        axis.text.y = element_blank()) +
  scale_fill_distiller(breaks=c(0, .2, .4, .6, .8, 1),
                       direction = 1,
                       na.value = "#fafafa",
                       # na.value = "transparent",
                       name="Percent West Indian Ancestry (%)",
                       labels=percent_format(accuracy = 1L)) +
  labs(
    title = "Brooklyn, West Indian Ancestry by Census Tract",
    caption = "Source: American Community Survey, 2016-20"
  ) + 
  geom_sf(data = boros |> filter(boro_name == "Brooklyn"), 
          color = "black", fill = NA, lwd = .5)

ggplotly(west_indian_map, tooltip = "text") |>
  layout(paper_bgcolor = "transparent") |>
  config(displayModeBar = FALSE)

As you can see from the map above …. (insert your observations)