[CTPP] PUMA Update

Mon Sep 14 15:02:31 CDT 2009

I am going to the SDC meeting and will be happy to provide 
feedback.  I'm printing this out now and will put it in the meeting folder.

Patty Becker

At 03:23 PM 9/14/2009, you wrote:
>Someone passed me this today.  Apparently it was posted to the State 
>Data Center list serve and provides the current status of what is 
>known about PUMAs.  PUMAs are of special importance to the 
>transportation community since they are now a tabulation geography 
>for ACS and provide the only wall-to-wall coverage of annual ACS 
>data for metropolitan areas.  If anyone along this list will be 
>involved with the referenced October 14-16 State Data Center meeting 
>please let us know what minimum population thresholds the CB plans 
>to propose for tract based PUMAs.
>
>=============
>State Data Center Network:
>
>The Census Bureau is currently drafting the 2010 Public Use 
>Microdata Area (PUMA) delineation proposed criteria.  These draft 
>proposed criteria were developed based on internal meetings with key 
>Census Bureau stakeholders, and with consideration of new challenges 
>and issues associated with the use of PUMAs in the publication of 
>annual American Community Survey (ACS) Public Use Microdata Sample 
>(PUMS) data as well as in the publication of ACS estimates.
>
>The Census Bureau will present the 2010 PUMA delineation proposed 
>criteria at the upcoming State Data Center Annual Meeting (October 
>14-16, 2009) for discussion and comment.  Subsequently, pending the 
>approval of the Census Bureau's Statistical Areas Committee, the 
>Census Bureau will publish the 2010 PUMAs proposed criteria in the 
>Federal Register for public comment. State Data Centers (SDCs) will 
>use the final version of these criteria, as published in a 
>forthcoming Federal Register, to delineate PUMAs for Census 2010 and the ACS.
>
>For your consideration, the following represents a high level 
>summary of the planned 2010 PUMA delineation proposed criteria:
>
>1. PUMA types: One "level" of PUMAs will be delineated for the 
>United States, Puerto Rico, Guam, and the U.S. Virgin Islands, as 
>compared with two "levels" of PUMAs for Census 2000 (super-PUMAs and 
>standard PUMAs).  Additionally, place of work PUMAs (POW PUMAs) and 
>migration PUMAs (MIG PUMAs) will be based on a single PUMA for 
>county-based PUMAs or an aggregation of adjacent PUMAs for 
>tract-based PUMAs.  Note: All subsequent references to PUMAs in this 
>document, unless preceded by "POW" or "MIG", refer to these standard PUMAs.
>
>2. Population Thresholds: Each PUMA must contain a minimum 
>population of 100,000 both at the time of delineation and throughout 
>the decade for the publication of ACS PUMS data and ACS 
>estimates.  For those areas currently experiencing population 
>decline, or where population decline throughout the decade is 
>expected, PUMAs should be initially delineated to include a 
>population significantly higher than 100,000 persons to accommodate 
>this change.  Should the population of a PUMA fall significantly 
>below the 100,000 person threshold, the PUMA will be combined with 
>one or more adjacent PUMAs for ACS PUMS and ACS estimate publication.
>
>3. PUMA Composition: All PUMA types (PUMAs, POW PUMAs and MIG PUMAs) 
>must nest within states (i.e., may not cross state 
>boundaries).   PUMAs will be based on aggregations of counties and 
>census tracts only. Incorporated places and MCDs will not be used as 
>building blocks for 2010 PUMAs. Census tracts may be aggregated to 
>approximate minor civil divisions, incorporated places, or census 
>designated places.
>
>Provided the PUMA meets the minimum population threshold:
>a.  One county may be designated as a PUMA
>b.  Two or more contiguous counties may be aggregated to create a PUMA
>c.  Contiguous census tracts may be aggregated to create a PUMA
>         Tract-based PUMAs may cross county boundaries, provided 
> that each PUMA-county part meets a minimum area and/or population 
> threshold (TBD - The Census Bureau is currently determining an 
> appropriate minimum area and population threshold for these areas, 
> and will provide these minimum thresholds at the SDC Annual Meeting 
> in October).
>         Census tract aggregations may compose or approximate the 
> extent of other types of geographic entities, including minor civil 
> divisions, incorporated places, and census designated places.
>
>4. PUMA contiguity In all cases, each PUMA must constitute a 
>geographically contiguous area. Limited exceptions are presented here:
>a. A PUMA may be discontiguous if a county is discontiguous.
>b. A PUMA may be discontiguous when it surrounds another whole PUMA, 
>e.g., if census tracts define a PUMA that approximates an 
>incorporated place or census designated place, a PUMA may be defined 
>to encompass the area within the county surrounding the place
>
>The Census Bureau also intends to propose additional guidelines to 
>which delineation participants are strongly encouraged, but not 
>required to, adhere.
>
>For your consideration, the following represents a high level 
>summary of the planned 2010 PUMA guidelines:
>
>1. Wherever possible, each PUMA should comprise an area that is 
>either entirely inside or entirely outside Core Based Statistical Areas
>2. The Census Bureau recommends that the number of five-percent 
>PUMAs be maximized, and that five-percent PUMAs should not contain 
>more than 200,000 people, wherever possible, unless the PUMA is 
>defined for an area that is or will be experiencing population decline.
>
>We appreciate your interest in the 2010 PUMA delineation program, 
>and look forward to discussing the planned proposed criteria with 
>you at the SDC Annual Meeting in October 2009.  Should you have more 
>immediate questions please contact the Geographic Standards and 
>Criteria Branch PUMA team at geo.puma at census.gov.
>--
>Ed Christopher
>708-283-3534 (V)
>708-574-8131 (cell)
>
>FHWA RC-TST-PLN
>4749 Lincoln Mall Drive, Suite 600
>Matteson, IL  60443
>
>_______________________________________________
>ctpp-news mailing list
>ctpp-news at chrispy.net
>http://www.chrispy.net/mailman/listinfo/ctpp-news
>

-------------------------------------------------------------------------------------------------
Patricia C. (Patty) Becker         248/354-6520
APB Associates/SEMCC       FAX 248/354-6645
28300 Franklin Road                 Home 248/355-2428
Southfield, MI  48034                     pbecker at umich.edu 
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://www.chrispy.net/pipermail/ctpp-news/attachments/20090914/60630342/attachment.html