23 Mar
2022
23 Mar
'22
1:36 p.m.
Oops, I should’ve replied to the entire listserv.
2006-2010 and 2011-2015 are based on Census 2010 geography…. The geography is based on the
last year in the five-year period.
Certain geographies, like congressional districts, state legislative districts, PUMAs, may
change in the decade.
PUMAs released for 2016-2020 are most likely the older, 2010 Census-based PUMAs. That’s
because the 2020 PUMAs are just being finished up right now. They’ll probably be in future
ACS packages. I THINK the 2017-2021 ACS PUMS will be based on the 2020 Census-based PUMAs.
That should be released this fall?
MSAs may change, too, based on what OMB dictates.
There’s probably a Census Bureau Geography web page that explains all. I just don’t know
where that is!! Oh well
Chuck
On Mar 22, 2022, at 1:23 PM, Rob Case
<rcase(a)hrtpo.org> wrote:
Chuck,
You wrote below that the 2016-2020 ACS is based on 2020 geography.
Which geographies are 2006-2010 and 2011-2015 based on?
Thanks.
Rob
PS BTW, I was able to download ACS data for my MSA using the Census’ table page
https://data.census.gov/cedsci/table?q=United%20States
<https://data.census.gov/cedsci/table?q=United%20States>
From: Charles Purvis <clpurvis(a)att.net <mailto:clpurvis@att.net>>
Sent: Thursday, March 17, 2022 6:10 PM
To: The Census Transportation Products Program Community of Practice/Users discussion and
news list <ctpp(a)listserv.transportation.org
<mailto:ctpp@listserv.transportation.org>>
Subject: [CTPP News] New five-year ACS tables released today: March 17, 2022
The Census Bureau released the five-year, 2016-2020 American Community Survey tables
today. The r-package TIDYCENSUS worked without a hitch this morning.
In case folks are interested in using TIDYCENSUS to examine the three sets of
non-overlapping periods: 2006-2010, 2011-2015 and 2016-2020, I’ve updated my R script for
all states, counties, places and the US. This is just for the means of transportation to
work, plus a few key demographic variables.
https://gist.github.com/chuckpurvis <https://gist.github.com/chuckpurvis>
Important to note is that the 2016-2020 ACS is based on 2020 Census geography. The older
datasets are based on 2010 Census geography. This isn’t a big deal if your geographic
areas haven’t changed, 2010 to 2020, but I’d be careful when comparing older (pre-2020) to
newest (2016-2020) data, especially for smaller geographies such as tracts, block groups
and places.
My next step would be to do some count checks of geographies included in Census 2020 PL
94-171 vs the 2016-2020 ACS. Check to make sure that the geographies (block groups,
tracts, places, counties) match between the Decennial 2020 and ACS 2016-2020.
And to reiterate, there is no single year ACS data for 2020. Those tables are using the
“experimental weights” and are only published at the nation and state level.
Happy St Patrick’s Day to all!
Chuck Purvis,
Hayward, California
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