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Policy Planning and Other Descriptive Analyses Using ACS Data 101 be introduced as the population and household characteristics change over the time period for which the estimates are accumulated. For some characteristics and small geographic areas, estimates may be unavailable due to Cen- sus Bureau limitations on estimates for small numbers of people if there is a possibility that an individual could be identified. Some case study examples where these issues play a part in the analysis are shown in the fol- lowing sections. 5.4 Other Specific Uses of Census Data for Descriptive Analyses Some specific transportation planning examples of the use of descriptive analyses include the following: Southern California Association of Government's development of socioeconomic profiles, posted online.47 Development of community profiles for each jurisdiction of the Baltimore Metropolitan Council.48 Missouri DOT's use of Census 2000 data for developing socioeconomic profiles for planning districts. Social and economic data in the form of maps, charts, and tables were created for planning districts, regional planning commissions, and MPOs and are located on the website. A complete listing of Missouri DOT's use of census data is compiled in Lance R. Huntley et al., 2003.49 A census book, containing information and profiles for each of the communities, produced every 10 years at Tulare County Association of Governments.50 The use of PUMS data at MTC to produce demographic profiles of telecommuters in Marin County. 47 See www.scag.ca.gov/economy/socioecondata.html, November 2003. 48 See www.baltometro.org/CP/CommunityProf.html, January 12, 2004. 49 Lance R. Huntley, Tracy Dranginis, and Ernie Perry. "Development and Use of Social and Economic Data at MoDOT," Missouri Department of Transportation, Research, Development, and Technology, August 2003, posted online at http://168.166.124.22/RDT/reports/Ri00049/RDT03011.htm. 50 Other agencies contacted during this research that are using census data for reporting purposes include Den- ver Regional Council of Governments, Chicago Area Transportation Study, Hampton Roads Planning District Commission, and Yakima Valley Conference of Governments.