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Posted Mar 24, 2017, 5:45 PM
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Registered User
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Join Date: Sep 2009
Location: Austin -> San Antonio -> Columbia -> San Antonio -> Chicago -> Austin -> Denver
Posts: 5,303
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Quote:
Originally Posted by lzppjb
I'm not good with word problems. lol
As I said, it's been a few years since I did the math, but I do remember calculating commuters from Travis into Burnet, for example. I just don't remember exactly how.
I figure things out, use it, then immediately forget it.
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In my word vomit I also misspoke anyway, so here's a better explanation:
https://www.federalregister.gov/docu...tistical-areas
Quote:
Section 1. Population Size Requirements for Qualification of Core Based Statistical Areas
Each CBSA must have a Census Bureau delineated urbanized area of at least 50,000 population or a Census Bureau delineated urban cluster of at least 10,000 population. (Urbanized Start Printed Page 37250areas and urban clusters are collectively referred to as “urban areas.”)
Section 2. Central Counties
The central county or counties of a CBSA are those counties that:
(a) Have at least 50 percent of their population in urban areas of at least 10,000 population; or
(b) Have within their boundaries a population of at least 5,000 located in a single urban area of at least 10,000 population.
A central county is associated with the urbanized area or urban cluster that accounts for the largest portion of the county's population. The central counties associated with a particular urbanized area or urban cluster are grouped to form a single cluster of central counties for purposes of measuring commuting to and from potentially qualifying outlying counties.
Section 3. Outlying Counties
A county qualifies as an outlying county of a CBSA if it meets the following commuting requirements:
(a) At least 25 percent of the workers living in the county work in the central county or counties of the CBSA; or
(b) At least 25 percent of the employment in the county is accounted for by workers who reside in the central county or counties of the CBSA.
A county may be included in only one CBSA. If a county qualifies as a central county of one CBSA and as outlying in another, it falls within the CBSA in which it is a central county. A county that qualifies as outlying to multiple CBSAs falls within the CBSA with which it has the strongest commuting tie, as measured by either 3(a) or 3(b) above. The counties included in a CBSA must be contiguous; if a county is not contiguous with other counties in the CBSA, it will not fall within the CBSA.
Section 4. Merging of Adjacent Core Based Statistical Areas
Two adjacent CBSAs will merge to form one CBSA if the central county or counties (as a group) of one CBSA qualify as outlying to the central county or counties (as a group) of the other CBSA using the measures and thresholds stated in 3(a) and 3(b) above.
Section 5. Identification of Principal Cities
The Principal City (or Cities) of a CBSA will include:
(a) The largest incorporated place with a 2010 Census population of at least 10,000 in the CBSA or, if no incorporated place of at least 10,000 population is present in the CBSA, the largest incorporated place or census designated place in the CBSA; and
(b) Any additional incorporated place or census designated place with a 2010 Census population of at least 250,000 or in which 100,000 or more persons work; and
(c) Any additional incorporated place or census designated place with a 2010 Census population of at least 50,000, but less than 250,000, and in which the number of workers working in the place meets or exceeds the number of workers living in the place; and
(d) Any additional incorporated place or census designated place with a 2010 Census population of at least 10,000, but less than 50,000, and at least one-third the population size of the largest place, and in which the number of workers working in the place meets or exceeds the number of workers living in the place.
Section 6. Categories and Terminology
A CBSA is categorized based on the population of the largest urban area (urbanized area or urban cluster) within the CBSA. Categories of CBSAs are: Metropolitan Statistical Areas, based on urbanized areas of 50,000 or more population, and Micropolitan Statistical Areas, based on urban clusters of at least 10,000 population but less than 50,000 population. Counties that do not fall within CBSAs will represent “Outside Core Based Statistical Areas.”
A NECTA is categorized in a manner similar to a CBSA and is referred to as a Metropolitan NECTA or a Micropolitan NECTA.
Section 7. Divisions of Metropolitan Statistical Areas and New England City and Town Areas
(a) A Metropolitan Statistical Area containing a single urbanized area with a population of at least 2.5 million may be subdivided to form smaller groupings of counties referred to as Metropolitan Divisions. A county qualifies as a “main county” of a Metropolitan Division if 65 percent or more of workers living in the county also work within the county and the ratio of the number of workers working in the county to the number of workers living in the county is at least .75. A county qualifies as a “secondary county” if 50 percent or more, but less than 65 percent, of workers living in the county also work within the county and the ratio of the number of workers working in the county to the number of workers living in the county is at least 75.
A main county automatically serves as the basis for a Metropolitan Division. For a secondary county to qualify as the basis for forming a Metropolitan Division, it must join with either a contiguous secondary county or a contiguous main county with which it has the highest employment interchange measure of 15 or more. After all main counties and secondary counties are identified and grouped (if appropriate), each additional county that already has qualified for inclusion in the Metropolitan Statistical Area falls within the Metropolitan Division associated with the main/secondary county or counties with which the county at issue has the highest employment interchange measure. Counties in a Metropolitan Division must be contiguous.
(b) A NECTA containing a single urbanized area with a population of at least 2.5 million may be subdivided to form smaller groupings of cities and towns referred to as NECTA Divisions. A city or town will be a “main city or town” of a NECTA Division if it has a population of 50,000 or more and its highest rate of out-commuting to any other city or town is less than 20 percent.
After all main cities and towns have been identified, each remaining city and town in the NECTA will fall within the NECTA Division associated with the city or town with which the one at issue has the highest employment interchange measure. Each NECTA Division must contain a total population of 100,000 or more. Cities and towns first assigned to areas with populations less than 100,000 will be assigned to the qualifying NECTA Division associated with the city or town with which the one at issue has the highest employment interchange measure. Cities and towns within a NECTA Division must be contiguous.
Section 8. Combining Adjacent Core Based Statistical Areas
(a) Any two adjacent CBSAs will form a Combined Statistical Area if the employment interchange measure between the two areas is at least 15.
(b) The CBSAs thus combined will also continue to be recognized as individual CBSAs within the Combined Statistical Area.
Section 9. Titles of Core Based Statistical Areas, Metropolitan Divisions, New England City and Town Divisions, and Combined Statistical Areas
(a) The title of a CBSA or NECTA will include the name of its Principal City with the largest 2010 Census population. If there are multiple Principal Cities, the names of the second-largest and (if present) third-largest Principal Cities will appear in the title in order of descending population size. If the Principal City Start Printed Page 37251with the largest 2010 Census population is a census designated place, the name of the largest incorporated place of at least 10,000 population that also is a Principal City will appear first in the title followed by the name of the census designated place. If the Principal City with the largest 2010 Census population is a census designated place, and there is no incorporated place of at least 10,000 population that also is a Principal City, the name of that census designated place Principal City will appear first in the title.
(b) The title of a Metropolitan Division will include the name of the Principal City with the largest 2010 Census population located in the Metropolitan Division. If there are multiple Principal Cities, the names of the second-largest and (if present) third-largest Principal Cities will appear in the title in order of descending population size. If there are no Principal Cities located in the Metropolitan Division, the title of the Metropolitan Division will use the names of up to three counties in order of descending 2010 Census population size.
(c) The title of a NECTA Division will include the name of the Principal City with the largest 2010 Census population located in the NECTA Division. If there are multiple Principal Cities, the names of the second-largest and (if present) third-largest Principal Cities will appear in the title in order of descending population size. If there are no Principal Cities located in the NECTA Division, the title of the NECTA Division will use the names of up to three cities or towns in descending 2010 Census population size.
(d) The title of a Combined Statistical Area will include the names of the two largest Principal Cities in the combination and the name of the third-largest Principal City, if present. If the Combined Statistical Area title duplicates that of one of its component CBSAs, the name of the third-most-populous Principal City will be dropped from the title of the Combined Statistical Area.
(e) Titles also will include the names of any State in which the area is located.
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