Download summary files from Census Bureau and extract data from the summary files.
12/11/2022: ACS 2017-2021 5-year data is available in the development version.
03/19/2022: ACS 2016-2020 5-year data is available in the development version.
12/10/2020: Version 0.6.5 is on CRAN. The 2019 ACS 5 year data was added to the package. The package now includes all latest data since 2000:
# development version
devtools::install_github("GL-Li/totalcensus")
# from CRAN, 2020 and 2021 ACS 5-year not included yest.
install.packages("totalcensus")
This package requires downloading census data and you need to create a
folder to store the downloaded data. Let’s call the folder
my_census_data
and assume the full path to this folder is
xxxxx/my_census_data
. Run the function below to set the path for the
package.
library(totalcensus)
# Use "/" to specify path even for Windows. Do not use "\".
set_path_to_census("xxxxx/my_census_data")
This package extract data directly from summary files of Decennial Censuses and American Community Surveys (ACS). The summary files store the summary data compiled directly from the original survey questionnaires filled out by each household. They are the most comprehensive datasets available to the public. By directly accessing the summary files, we are able to extract any data offered by Decennial Census and ACS.
By downloading summary file to your computer, it is particularly fast and convenient to extract high resolution data at census tract, block group, and block level for a large area.
Here is an example of how we extract the median home values in all
block groups in the United States from 2011-2015 ACS 5-year survey with
this package. You simply need to call the function read_acs5year()
. It
takes 15 seconds for my 7-years old laptop to return the data of all
217,739 block groups. In addition to the table contents we request, we
also get the population and coordinate of each block group.
library(totalcensus)
home_national <- read_acs5year(
year = 2018,
states = states_DC, # all 50 states plus DC
table_contents = "home_value = B25077_001",
summary_level = "block group"
)
With the coordinates, we can visualize the data on US map with ggplot2
and ggmap
. Each data point in the figure below corresponds to a a
block group, colored by median home value and sized by population. This
plot not only displays the median home values, but also tells population
densities on the map.
There are additional benefits of using this package:
totalcensus
package.read_xxxx()
functionsThe package has three functions to read decennial census, ACS 5-year
survey, and ACS 1-year survey: read_decennial()
, read_acs5year()
,
and read_acs1year()
. They are similar but as these datasets are so
different, we prefer to keep three separate functions, one for each.
The function arguments serve as filters to select the data you want:
c("male = B01001_002", "female = B01001_026")
.c("New York metro", "PLACE = UT62360", "Salt Lake City city, UT")
.Functions read_acs1year()
and read_acs5year()
have additional
argument:
search_xxxx()
functionsThere are a family of search_xxx()
functions to help find table
contents, geoheaders, summary levels, geocomponents, FIPS codes and CBSA
codes.
The following examples demonstrate how to use these read_xxx()
and
search_xxx()
functions.
A property management company wants to know the most recent rents in major cities in the US. How to get the data?
We first need to determine which survey to read. For most recent survey data, we want to read 2018 ACS 1-year estimates, which provide data for geographic areas with population over 65000.
We also need to determine which data files to read. We know summary
level of cities is “160” or “place”. Browsing with
search_summarylevels("acs1")
, we see that this summary level is only
in state files of ACS 1-year estimates. So we will read all the state
files.
Then we need to check if 2018 ACS 1-year estimate has the rent data. We
run search_tablecontents("acs1")
to open the dataset with View()
in
RStudio. You can provide keywords to search in the function but it is
better to do the search in RStudio with filters. There are so many
tables that contains string “rent”. It takes some time to find the right
one if you are not familiar with ACS tables. After some struggle, we
think B25064_001 is what we want.
We do not need to specify areas
and geo_headers
as we are extracting
all geographic areas matches the conditions.
Below is the code that gives what we want. The first time you use
read_xxxx()
functions to read data files, you will be asked to
download data generated from decennial census 2010 and summary files
required for this function call, in this case, 2018 ACS 1-year summary
files. Choose 1 to continue.
rent <- read_acs1year(
year = 2018,
states = states_DC,
table_contents = "rent = B25064_001",
summary_level = "place"
)
# Fisrt 5 rows
# GEOID NAME STUSAB population rent GEOCOMP SUMLEV lon lat
# 1: 16000US0203000 Anchorage municipality, Alaska AK 298192 1296 total 160 -149.27435 61.17755
# 2: 16000US0107000 Birmingham city, Alabama AL 213434 777 total 160 -86.79905 33.52744
# 3: 16000US0121184 Dothan city, Alabama AL 67714 720 total 160 -85.40682 31.23370
# 4: 16000US0135896 Hoover city, Alabama AL 84943 1021 total 160 -86.80558 33.37695
# 5: 16000US0137000 Huntsville city, Alabama AL 196225 766 total 160 -86.53900 34.78427
It is always nice to visualize them on US map.
library(ggplot2)
# ggmap requires
library(ggmap)
# You need to use your own google clound API key
register_google("your_google_api_key")
us_map <- get_map("united states", zoom = 4, color = "bw")
ggmap(us_map) +
geom_point(
data = rent[order(-population)],
aes(lon, lat, size = population/1e3, color = rent)
) +
ylim(25, 50) +
scale_size_area(breaks = c(100, 200, 500, 1000, 2000, 5000)) +
scale_color_continuous(low = "green", high = "red") +
labs(
color = "monthly\nrent ($)",
size = "total\npopulation\n(thousand)",
title = "Monthly rent in cities over 65000 population",
caption = "Source: 2016 ACS 1-year estimate"
) +
theme(
panel.background = element_blank(),
axis.title = element_blank(),
axis.text = element_blank(),
axis.ticks = element_blank(),
title = element_text(size = 14)
)
Only the decennial census has data down to block level. The most recent one is Census 2010.
Knowing names of a city, county, metro area, or town, we can feed them
directly to argument areas
. The returned data.table contains the table
contents we want as well as population and coordinates. The reading
takes a few seconds.
# read data of black population in each block
black_popul <- read_decennial(
year = 2010,
states = "IN",
table_contents = "black_popul = P0030003",
areas = "South Bend city, IN",
summary_level = "block"
)
# first 5 rows of black_popul:
# area lon lat state population black_popul GEOCOMP SUMLEV
# 1: South Bend city, IN -86.21864 41.63613 IN 28 10 all 100
# 2: South Bend city, IN -86.21659 41.63670 IN 0 0 all 100
# 3: South Bend city, IN -86.22172 41.63573 IN 52 16 all 100
# 4: South Bend city, IN -86.22022 41.63182 IN 279 21 all 100
# 5: South Bend city, IN -86.22093 41.63367 IN 42 1 all 100
It is better to separate data manipulation from reading to save reading
time as you usually need to try multiple manipulations. Data
manipulation can be done with data.table
or dplyr
.
library(magrittr)
# remove blocks where no people lives in and add a column of black percentage.
black <- black_popul %>%
.[population != 0] %>%
# percentage of black population in each block
.[, black_pct := round(100 * black_popul / population, 2)]
Again we visualize percentage of black population on map with ggplot2
and ggmap
.
south_bend <- get_map("south bend, IN", zoom = 13, color = "bw")
ggmap(south_bend) +
geom_point(
data = black,
aes(lon, lat, size = population, color = black_pct)
) +
scale_size_area(breaks = c(10, 100, 200, 500)) +
scale_color_continuous(low = "green", high = "red") +
labs(
color = "% black",
size = "total\npopulation",
title = "Black communities in South Bend city at block level",
caption = "Source: Census 2010"
) +
theme(
panel.background = element_blank(),
axis.title = element_blank(),
axis.text = element_blank(),
axis.ticks = element_blank(),
title = element_text(size = 14)
)
This package requires downloading census data to your local computer.
You will be asked to download data when you call read_xxxx
functions.
The downloaded data will be extracted automatically to the folder
my_census_data
.
A set of data generated from Census 2010 will also be downloaded, which is used to fill missing geographic header records in ACS data.
The census data can be found on Census Bureau’s website but you do not need to download them manually. Use the function above.
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.