Hi Chuck-
RE: QUESTION: When will the 2020 Census Summary File #1 be released?
Census Bureau announced in 2019 that the product formerly known as SF1 would be reduced --
fewer tables, especially fewer crosstabs -- and that the new collection of tables would be
called Demographic & Housing Characteristics (DHC). I have not seen any news lately
on what the final set of DHC tables will include. It's possible that this is *still*
unsettled?
I am not surprised that you found nothing on
census.gov. Census execs were earlier
promising DHC as a product... but then in 2021 they pivoted to: make no promises of
anything. They scrubbed mentions of DHC off of
census.gov.
(oh. But they didn't get everything...
https://www2.census.gov/about/partners/cac/nac/meetings/2021-05/presentatio…
)
WHEN will we see the DHC product? was asked by journalists at the August 12 webcast press
conference - and Census spokespeople would not answer the question.
Hopefully we get DHC product sometime in 2022. Earlier than 2022 seems unlikely because
DAS/Differential Privacy processing is going to add multiple months.
But I would be guessing. Again, If someone has actual intel, point us there!
--TG
[Metropolitan Council Logo]
Todd Graham
Principal Forecaster | Research
Metropolitan Council
390 North Roberrt Street, St. Paul, MN 55101
Ph. 651-602-1322
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From: Charles Purvis <clpurvis(a)att.net>
Sent: Wednesday, August 25, 2021 1:31 PM
To: The Census Transportation Products Program Community of Practice/Users discussion and
news list <ctpp(a)listserv.transportation.org>
Subject: [CTPP News] Re: Defining PUMAs for Census 2020
Todd:
The pro-tips on building PUMAs (discourage splitting counties; encourage consistency with
city boundaries) make great sense.
(I've had a lot of fun using the POWPUMA data from PUMS. In California we have 58
counties and 41 POWPUMAs. Good for trying to analyze county-to-county commute patterns
over the years.)
QUESTION: When will the 2020 Census Summary File #1 be released? I can't find the
information on the Census Bureau's website. My hunch is that it will be about four
months after the PL 94-171 data is released, perhaps by December 2021???
The SF1 (STF1A to old-timers) will have the detailed "short form" tabulations
including: households by household size, detailed age cohort tables; householder tables;
detailed hispanic groups; detailed asian groups; owner/renter tenure; etc.
Chuck
On Aug 23, 2021, at 1:01 PM, Graham, Todd
<todd.graham@metc.state.mn.us<mailto:todd.graham@metc.state.mn.us>> wrote:
Hi Chuck-
Thanks for the heads-up. Yes, that is the way to think of PUMAs = as
"super-districts" or sub-state regions.
Here are my "pro-tips" learned in PUMA drawing 10 years ago:
1. Do not group together fractional pieces of counties when you could keep a county
whole, or when you could group multiple whole counties together in a PUMA.
2. When splitting counties into multiple PUMAs, try to arrange for the split lines to
be stable city/town boundaries. This means you're looking to create PUMAs where
city/town boundaries are aligned with Tract boundaries. (Because Census Geog Dept will
require that tracts be the basic units of PUMA assembly.)
The reason I emphasize parsimony with counties in point #1 is: The PUMAs you draw will
enable or limit the detail of MIGPUMAs as well. (MIGPUMA= Migration origination geographic
units) Census Bureau will create MIGPUMAs as the least common denominator grouping of
counties that is entirely coincident with a group of PUMAs. So don't split counties
unnecessarily.
The reason I emphasize city/town boundaries in point #2 -- even though Census Geog
discusses tracts as the basic units - is this: The PUMAs you draw will enable or limit the
detail of POWPUMAs. (POWPUMAs = Place of Work geographic units) Census Bureau will create
POWPUMAs as the least common denominator grouping of counties + places that is entirely
coincident with a group of PUMAs.
Stated differently: Census looks for combinations of county + place to uniquely nest
within a POWPUMA.
Why is this the standard for POWPUMAs? It's because of the questions asked on ACS:
ACS asks specifically for the county + place of one's work location. The PUMA final
criteria document
https://www.census.gov/programs-surveys/geography/guidance/geo-areas/pumas/…
does say all this, but you'd have to read all the way to the last 3 pages of that
document to find it.
That's all my advice. Good luck!
--Todd Graham