We’re in the middle of a 90 day period to delineate new, Census 2020-based PUMAs (Public Use Microdata Areas) (November 2021 - January 2022).
PUMAs are used not only in Census Bureau PUMS (Public Use Microdata Sample data); but in standard tabulations (1-year, 5-year) of American Community Survey (ACS) data.
This PUMA development process is basically of interest to MPOs, State DOTs, academics and researchers of area with counties greater than 200,000 population (potentially splittable counties).
Read more about the PUMA process here:
https://www.census.gov/programs-surveys/geography/guidance/geo-areas/pumas/… <https://www.census.gov/programs-surveys/geography/guidance/geo-areas/pumas/…>
The Census Bureau process focuses on the use of the free GIS system QGIS and the free add-on GUPS (Geographic Update Partnership Software) to prepare new PUMAs. Read through this carefully, but understand that the MPO staff don’t necessarily need to use QGIS + GUPS to prepare the tract-to-PUMA equivalency files. This CAN be done in other software (ArcGIS?) and then transmitted to your State Data Center so they can do the necessary edit checks and transmittal of final statewide proposals to the Census Bureau. Recommendation: work with your State Data Center on how to transmit the necessary tract-to-PUMA equivalency files.
For the San Francisco Bay Area, I used both R and QGIS for this process. Both R (using R Studio software) and QGIS are free — in my price range!
Attached is my R script which was used to obtain tract-level data using the TIDYCENSUS package; place-level data using TIDYCENSUS; and old Census 2010-based PUMAs using the TIGRIS package. I had to use the SF package (simple feature) to do some basic GIS processes in R, before I exported relevant SHP files that I could use in QGIS. Use ArcGIS or other GIS packages, of course.
I was able to expand the number of PUMAs in the nine-county San Francisco Bay Area (population=7.765 million) from 55 PUMAs (2010 Census) to 63 PUMAs (2020 Census). And we should have plenty of time to debate and deliberate in our local community (counties, cities, transit operators, academics, PUMA/PUMS users) before handing proposals over to the State Data Census & the Census Bureau.
Hope this helps!
Chuck Purvis
Hayward, California
Hello CTPP Userfolk:
The next AASHTO CTPP Program Online Class will be this coming Wednesday, the 17th from 2pm to 4pm Eastern Time.
We will be discussing the different aspects of CTPP data that make these data so valuable (and sometimes a little puzzling). The class will cover topics such as ACS data collection, what is included (and not included) in CTPP, and how CTPP compares with other data sources. We hope you will gain important insights on how to interpret the data, how to understand margins-of-error, the effects of the Census Bureau's data disclosure prevention rules, and more.
Our goal is to have participants leave the class with the knowledge to understand all the nuances of the CTPP data so that we can all joyfully crunch away with the data.
Please join us! Details below.
Be well,Kevin
Getting to Know CTPP Data
Event: Getting to Know CTPP Data
When: Wednesday 17 November 2021, 02:00 PM - 04:00 PM
Time Zone: (GMT-04:00) Eastern Time (US and Canada)
Audio Conference Details:
To register now, please visit the following link:
https://aashto.adobeconnect.com/gettingtoknowctppdata/event/registration.ht…
To know more about the event, please visit our website:
https://aashto.adobeconnect.com/gettingtoknowctppdata/event/event_info.html
This may be of interest to some. Apologies if you already saw this.
-------- Forwarded Message --------
[Population Reference Bureau] Update from American Community Survey
Data Users Group
<https://acsdatacommunity.prb.org/>
Census Bureau Statement on 2016-2020 ACS
The U.S. Census Bureau is committed to producing high-quality data. The
Census Bureau recognizes the critical importance of the American
Community Survey (ACS) 5-year data, in particular, on government and
business decision-making and the need for quality ACS data for that purpose.
To reflect our quality standards, the Census Bureau must delay the
2016-2020 ACS 5-year data release originally targeted for December 2021.
Additional time is needed to continue refining our methodology so that
we can minimize the impact of nonresponse bias due to the COVID-19
pandemic. Our current plan targets a March 2022 release date. We expect
to provide an update in December.
Here's the link to the statement: Census Bureau Statement on 2016-2020
American Community Survey
<https://www.census.gov/newsroom/press-releases/2021/acs-5-year-2016-2020.ht…>
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