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GeoLytics News: April 2007

Thursday, April 26, 2007

2007 Estimates and 2012 Projections Now Available

Get the latest U.S. population demographics with the 2007 Estimates and 2012 Projections from GeoLytics. The 2007 Estimates and 2012 Projections include the Census Bureau’s post-hurricane county level estimates that adjusts for population displacements in the Gulf States. This invaluable demographic data is an essential
tool for business and marketing, as well as for current social research.

The 2007 Estimates and 2012 Projections provide basic demographic variables for the current U.S. population and for 5-year projections of population trends. The 2007 Estimates and 2012 Projections are available on CD (will be coming soon online). Variables include total population, population change, total households, race, age, gender, household income, owners vs. renters, and more. The data from the estimates
and projections is available in 5 geographies: states, counties, tracts, block groups, and zip codes. You can also run a radius around a latitude/longitude point. For more information: http://geolytics.com/USCensus,Estimates-Projections,Products.asp

If you need more data than the basic 2007 Estimates and 2012 Projections provide, then you need the Estimates Professional 2007/2012. This product includes all the variables on the standard Estimates and Projections product, and also includes complete break-outs of sex-by-age-by-race, household types and household size, median incomes by race, and much more.

In addition, the Estimates Professional 2007/2012 has consumer expenditures and demographic profiles. Get consumer household spending for 2007 and 2012, as well as useful demographic profiles of geographic areas. The Estimates Professional is available on DVD (coming soon online) and in the same geographies: states, counties, tracts, block groups, zip codes, and radius. For more information, go to: http://geolytics.com/USCensus,Estimates-Professional,Products.asp

GeoLytics is also able to build custom data sets for estimates and projections. Examples of custom work include creating data for boundaries other than our standard ones (state, county, zip, tract, block group), creating new variables, or creating data for different time periods other than 2007/2012, either earlier years like 2001, 2002, 2003 and so forth, or projecting out other years such as 2008, 2009, 2010 or more. Call us to discuss the details for your specific project.

For more information on all of GeoLytics demographic data, current year estimates, and 5-year projections go to: http://www.geolytics.com/USCensus,Estimate-Projections,Categories.asp

Thursday, April 19, 2007

StreetDVD 2006 Version 2.0

Get GeoLytics' StreetDVD 2006, Version 2.0 for quick and easy downloads of the latest 2006 2nd Edition TIGER/Line(R) Files. This 3 DVD set includes the economic census boundaries and updated voting districts. You get all of the latest Census Bureau updates and geographic layers in this very easy to use data set.

With StreetDVD 2006 Version 2.0, you’ll quickly export any layers from the 2006 2nd Edition TIGER/Line(R) Files for seamless importing of geographic data into ArcView and MapInfo. With GeoLytics intuitive windows interface you export boundaries in seconds. You can also view and map the layers yourself with the product’s built-in map viewer.

StreetDVD 2006 is also very easy to use. All you have to do is click on the geographic layers you want, pick the geography, and run your selection – that's it! It instantly creates ArcView shapefiles, and you can quickly convert these to MapInfo files with another click of the mouse.

In addition to economic census boundaries and voting districts, the StreetDVD 2006 provides detailed classifications and data for all roads, railroads, hydrography, and landmarks, as well as legal, statistical, and administrative boundaries for census, transportation, education, and more. You also get address range and zip+4 data for building your own geocoders.

For more information about StreetDVD 2006 or to take a guided tour, please visit our website at:

Tuesday, April 3, 2007

Comparing Census Data from Different Years and Different Geographies

Comparing data sets collected from different census years has many obstacles for time series analysis. One primary obstacle is the changing geographic boundaries between data sets. The issue of changing geographic boundaries is one every researcher has to tackle if she wants to compare census data from one year or decade to another. For example, census boundaries such as tracts and block groups typically change between censuses, as well postal boundaries such as zip codes. So how does a researcher deal with these changing boundaries if she wants to examine and compare data at smaller units of analysis? The answer is cross-walking data from one set of boundaries to another, so that the data being compared is in the same set of boundaries. This process is called normalizing the data.

GeoLytics offers several normalized data sets that transfers data from one time period cross-walked to the 2000 census boundaries. The Neighborhood Change Database has 1970, 1980, and 1990 data normalized to 2000 tract boundaries. The 1980 in 2000 Boundaries CD and the 1990 in 2000 Boundaries CD have the data cross-walked to all the 2000 Long Form geographies, not just tracts. Thus you can look at the 1980 or 1990 data in the 2000 zip codes, block groups, MCDs and more.

For a list of our individual normalized products and our two discounted product packages, go to:

Another question researchers may tackle is how two geographies relate to one another. For Example, what County is a given Zip Code in? The United States Census Bureau (USCB) defines many geographies as subsets of a larger geography (i.e. counties in the state). But there are also many geographies that the USCB does not define as subsets of each other. The smaller area must be wholly contained within the larger for all parts of the country to allow this subarea definition. Zip codes (or school districts, etc) are areas that are not nested subareas and do not allow smaller geographies (tracts and block groups) to be subareas of them. Thus if someone wants to know what county a zip code is in or what tracts are in a given zip code this is not something that the USCB data will answer directly.

Because of this shortcoming, GeoLytics has created the Area Correspondence File to answer such questions. Different researchers have different research needs so we have built flexibility into this program. There are two types of selections so as to best meet your needs: dominant area vs. all available area (which only lists one dominant area), and weighting by population vs. land area (which gives the percent of coverage for each subarea). We can create a correspondence between any two geographic areas from the 2000 Census. So for example, we can tell you the zip codes in an MSA or all the tracts in a census defined place, etc. For more informaiton on area to area correspondence, go to:


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