Sunday, May 04, 2014

Power of 12

Can you name the counties that form the Pittsburgh Combined Statistical Area (CSA)? I actually had this wrong until recently.  Something that isn't anything new, in fact it is from a year ago, but0 I didn't notice revisions made to the definitions of local Core Based Statistical Areas (CBSAs).

Some background first. A decade ago a lot of the definitions used to define metropolitan statistical areas changed. MSAs are defined primarily by commuting flows.  If the population of an areas is large enough, and pairs, or groups, of counties have sufficiently high flows of commuters between them, they are considered to be integrated in one of various ways depending on how big the area is, and how big the commuting flows are.

There used to be metropolitan statistical areas, typically collections of counties, or in New England collections of municipalities. If two or more metropolitan statistical areas were near each other, the collection of MSAs were called Combined Metropolitan Statistical areas (CMSAs).

Then those definitions changed changed. First a new set of areas were created called micropolitan statistical areas were created. Places not big enough to really be considered metropolitan statistical areas, but still bigger than a lot of other smaller areas.  CMSAs as previously defined went away, so if you catch anyone talking about the Pittsburgh CMSA, they are a couple decades out of touch.  Now, really big metropolitan statistical areas can have subdivisions called metropolitan divisions, a bit analogous to what long ago were called Primary Metropolitan Statistical Areas (PMSA), also a term no longer in use.

The collection of metropolitan AND micropolitan statistical areas are types of the more generic core based statistical areas (CBSAs).  Now if adjacent CBSAs (metro or micro areas) are sufficiently integrated by commuting patterns they form a separate Combined Statistical Areas (CSA). Notice how you really ought not use the acronym MSA any longer, since it does not distinguish between metros and micros.

Deep breath.

In 2003, the Pittsburgh MSA was defined to be 7 counties (Allegheny, Armstrong, Beaver, Butler, Fayette, Washington and Westmoreland).  Armstrong was new to the MSA just that year. There were 2 nearby micropolitan statistical areas: Indiana County formed one, and Lawrence County (the New Castle micropoltian area) formed the other.  Indiana was kind of an independent CBSA without sufficient commuting into the Pittsburgh MSA to be linked to it within the CSA definition at the time.  However, the New Castle micro (otherwise known as Lawrence County) did have sufficient commuting into Pittsburgh to be linked with it, so there was an 8 county CSA called the Pittsburgh-New Castle Combined Statistical Area.

Who is still reading?

So last year, and I am embarrassed to say I did not catch this at the time, but the occasional redefinition of CBSAs had some major changes to the definitions of CBSAs regionally as of February 2013. Two big changes.  1) Indiana County is now integrated into the Pittsburgh CSA. Still not integrated into the MSA, but the CSA.  A bigger change is that the Weirton-Steubenville Metropolitan Statistical Area became more formally linked to Pittsburgh.  It remains a separate metro area, but the two counties ( Brook and Hancock counties in WV and Jefferson County in OH) are also linked to Pittsburgh in a much bigger CSA.  So now there exists a 12 county Pittsburgh-New Castle-Weirton Combined Statistical Area.

So with the most recent revisions, one definition of Pittsburg stretches into both Ohio and West Virginia for the first time. Only 20 more counties to go.

I should have caught this sooner since a couple years ago I wonked out on what anticipated changes that were coming down the road.  But while I am slow in noticing...    Wikipedia gnomes know all. They even have a map of the 'new' Pittsburgh CSA:


Anonymous MH said...

Can we now technically call ourselves "the tri-state area"?

Monday, May 05, 2014 10:40:00 AM  
Anonymous BrianTH said...

We should have a Unification Day parade:

Anyway, it seems as if the Empire of Pittsburgh is using a flanking maneuver on the Kingdom of Youngstown

Monday, May 05, 2014 1:19:00 PM  
Anonymous marketdiamond said...

Hey I remember that map, where do I remember that map from? hmmm. BTW I always did like the lime green/solid yellow color scheme so your welcome wikipedia readers! :P

Now I wonder if I can guess the counties right . . . and as far as Nullspace, better late then never!

Monday, May 05, 2014 4:00:00 PM  
Anonymous The Wiz said...

How about a map of the Cleveland CSA? Bet it includes Youngstown/Mahoning Co. There is already a contingent of people from Boardman and Poland that commute to work in the Pitts airport area. So how long before the overlap CSAs and Cleveburgh is born?

Monday, May 05, 2014 7:10:00 PM  
Anonymous DBR96A said...

The Cleveland CSA does not include Youngstown, but it does include Akron, Canton, and even New Philadelphia. I-77 appears to be the spine of that region.

Tuesday, May 06, 2014 4:01:00 AM  
Anonymous BrianTH said...

Youngstown is the Alsace-Lorraine of our region.

Tuesday, May 06, 2014 8:13:00 AM  
Anonymous Anonymous said...

The unfortunate thing is that the additional counties are not in good economic shape... of course that's why many commute to Pittsburgh in the first place, but now the CSA will be increasingly crippled with declining counties in terms of population trends....


Tuesday, May 06, 2014 12:46:00 PM  
Anonymous Anonymous said...

I want Morgantown to join our CSA. They'll drag us toward growth.

Tuesday, May 06, 2014 12:49:00 PM  
Anonymous MH said...

This that what you call the Big 12?

Tuesday, May 06, 2014 2:16:00 PM  
Anonymous BrianTH said...

Although I understand that worry about statistical dilution in theory, does anyone actually use CSA statistics for any prominent purpose? It seems to me the vast, vast majority of relevant reports, studies, etc. focus on MSAs.

Wednesday, May 07, 2014 1:08:00 PM  
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Saturday, July 11, 2015 1:02:00 AM  

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