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Single-year Population Estimates from NCHS
In August the Census Bureau released its latest (through 2007) estimates of the population for U.S. counties by age, sex, race and hispanic origin. The age detail on those data sets was 5-year intervals (i.e. persons aged 0-4, 5-9, etc.) and the race categories were based on the current OMB standards that allow for multi-racial categories. Each year the National Center for Health Statistics (NCHS) commissions the Bureau to create an alternate set of estimates based on the same basic data and methodology, but which are for single years of age and for a set of four basic "bridged" race categories (white; black; American Indian, Eskimo or Aleut; and Asian or Pacific Islander.) The Missouri Census Data Center has downloaded and processed these data to update our nchsbri data directory (under the popests data directory). Uexplore/Dexter users can access these data directly, but more importantly general users can access the data using the MCDC's Population Estimates by Age web application, which now has 2007 on the Select Year(s) menu. Not only is this a more convenient way for most users to access the data, but it allows you to define your own age intervals. You can (for example) get breakdowns of the population aged 5 to 17, or aged 62 and older (for example) and you can get this broken down by county, race, sex and hispanic origin.
ACS Data Release Schedule for Remainder of 2008
The Census Bureau plans to release the rest of the single-year data products based on American Community Survey data collected in the 2007 calendar year on September 23. Previously (in late August), the Bureau released some economic data for 2007 and these data can be accessed now on their American FactFinder site. This represents about 20% of the 1-year data to be published for 2007. The Missouri Census Data Center will be downloading the raw data and working on our own custom profiles based upon these data, similar to what we did with the 2006 data. We estimate that it may take at least 2 or 3 weeks to complete processing once we are given access to the data. To see what we mean by our custom profiles follow the link to "ACS Profile Reports (2006)" at the top of our Quick Links box (right side of this and most other MCDC pages).
The Census Bureau has announced that it intends to release the first "period estimates" data based on ACS data collected for the 3-year period 2005 though 2007 on December 9 of this year. These base tables and profiles will be similar to the single year products discussed in the previous paragraph, but will be based on combining data from three years of surveys. The good news for data users is that these data will be available for geographic areas with populations of at least 20,000 in 2007. This means, for example, that in Missouri we shall then have data for about half the counties in the state (as compared to 16 counties for which we currently have single-year estimates using a population threshold of 65,000). Note that counties with 65,000 or more population there will be both single-year data and three-year period estimates; users will have to decided which they prefer to use.
Census Tract and Block Group Data for the Entire U.S.
Bowing to user demand (two requests in the same month!) the MCDC has added 2000 decennial census data for every census tract and
block group in the U.S. We already had data for the special "split block group" geographic areas (known to Census insiders as the
"summaryl level 090" data) and we were able to aggregate these to create the summaries for the complete census tracts (summary level 140) and block groups (summary level 150). We have complete sets of P and H tables from Summary File 3, and we used these data to create our standard sf3 extracts data sets (filetype sf32000x). These are the data we use to generate our populate SF3-based demographic profiles. You can now generate such a profile if you know how to code the parms for our dp3_2k web application. We hope to have a dynamic menu front-end application ready shortly to allow easy selecting of the tract or block group. To see an example try using the following link:
http://mcdc.missouri.edu/cgi-bin/broker?_PROGRAM=websas.dp3_2k.sas&_SERVICE=sasapp&st=06&co=001&tr=4001 . This results in a profile for census tract 4001 in Alameda county, California (06 is the state code for CA; 001 is the county code for Alameda; and 4001 is obvioulsy the code for tract 4001). To get data for block group 1 within this census tract just append the parm specification bg=1 to this URL.
Direct access to the complete P and H tables is limited for now to access via the table links within the dp3_2k profile reports. The complete-table data is stored on a different server and is not currently accessible via Uexplore/Dexter. This could change.
We do, of course, provide Uexplore/Dexter access to the extract data in the new data xxtrbgs subdirectory of sf32000x.
Katina Jones
In April Katina Jones was hired by the Missouri State Library as their Statistical Research Analyst and as the
Coordinator for the Missouri Census Data Center. Katina has a BA in Applied Psychology and Broad Field Social Science
from Alverno College in Wisconsin. She has prior experience as a research analyst and program evaluator for
several social service organizations. Katina has relocated to Jefferson City from St. Louis County where she
served for more than 7 years as the Marketing Coordinator for a specialty pharmaceutical company.
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