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Normalized Data Products

Coparing census demographics from different census years can be a difficult task due to changing geographic boundaries. Our normalized data product line assists researchers with comparisons of data across time by adjusting and weighting the census data to account for changes in geographies.

Our individual normalized product line includes:

Our normalized product packages include:

To demonstrate some of the issues associated with changing boundaries, below is a comparison of Pima County, Arizona in 1990 and 2000 at the Census Tract level. During this time span, Pima County expanded in population. A quick appraisal of the two maps below demonstrates the numerous changes that occurred in the census tract boundaries, specifically the addition of 83 tracts in 2000.

1990
Pima County, AZ
Total Census Tracts (115)
2000
Pima County, AZ
Total Census Tracts (198)

Which product makes sense for your project?

CensusCD Neighborhood Change Database [NCDB]
This single CD product is the easiest way to compare 1000+ variables from each of the 1970 Census, 1980 Census, 1990 Census, and 2000 Census with the 2010 Summary File 1 and 2010 American Community Survey. ). The 1970, 1980, 1990 and 2000 data sets come in both its year-specific boundaries and also weighted to the 2010 Census Tract boundaries. When you use it in the year-specific format, the data and maps are identical to that found in the CensusCD product for that given year. However, the NCDB is limited to Census Tracts only for the geography. Therefore, smaller geographies (block group) or larger geographies (zip code, county, or state) are not available in the NCDB. This product is ideally suited for neighborhood (tract) time series analysis over the five census periods. Regional planning groups, government agencies, and researchers looking at changes over time for these smaller areas often find this to be the best choice.

Census 2000 Long Form in 2010 Boundaries
ALL of the 2000 Census data for ALL of the geographies that it was released at is in the 2000 Long Form in 2010 Boundaries. This is an integral piece of the puzzle for those comparing data over the last 2, 3, 4 even 5 decades 1970-1980-1990-2000-2010. You could use the Neighborhood Change Database, but if you want any geographic levels other than the Census Tract than this is the best option. There are also variables available on the year specific products that are not included in the NCDB because of space constraints (for example some of the age break-outs were agglomerated). Ideally this would be paired with the 1990 Long Form in 2010 Boundaries and the most recent ACS or the 2010 SF1. This combination of products is for researchers who want to do time series analysis from 2000 to 2010 at any of the geographic levels. Therefore, when you compare it with the data from the Census 1990 in 2010 Boundaries and the 2010 ACS/SF1, researchers can track detailed changes in the population demographics. The Census 2000 in 2010 Boundaries is best suited for the researcher focused on trends from 2000 to 2010, who wants to look at the data at the most granular level (block group) or at one of the many larger geographies (Zip Code, MCD, County). The zip code level comparison can be especially important if you want to compare the data to an existing database of addresses with zip codes.

Census 1990 in 2010 Boundaries
This product lets users access ALL of the 1990 Censusdata for ALL of the geographies found in the 2010 American Community Survey (ACS). This is ideal for those comparing data over the last 3 decades 1990-2000-2010. You could use the Neighborhood Change Database, but if you want any geographic levels other than the Census Tract than this is the best option. There are also variables available on the year specific products that are not included in the NCDB because of space constraints (for example some of the age break-outs were agglomerated). Ideally this would be paired with the Census 2000 Long Form in 2010 Boundaries and the 2010 (or more recent) ACS or the 2010 SF1. This combination of products is for researchers who want to do time series analysis from 1990 to 2010 at any of the geographic levels. Therefore, when you compare it with the data from the Census 2000 in 2010 Boundaries and the 2010 ACS/SF1, researchers can track detailed changes in the population demographics. The Census 1990 in 2010 Boundaries is best suited for the researcher who focus on trends from 1990 to 2010, and wants to do the research at the most granular level (block group) or at one of the many larger geographies (Zip Code, MCD, County). The zip code level comparison can be especially important if you want to compare the data to an existing database of addresses with zip codes.

Census 1980 in 2010 Boundaries
Census 1980 in 2010 Boundaries includes ALL of the 1980 STF1 and STF3 Census data for ALL of the geographies found in the 2010 American Community Survey (ACS). This is ideal for those comparing data over the last 4 decades 1980-1990-2000-2010. You could use the Neighborhood Change Database, but if you want any geographic levels other than the Census Tract than this is the best option. There are also variables available on the year specific products that are not included in the NCDB because of space constraints (for example some of the age break-outs were agglomerated). Ideally this would be paired with the 1990 in 2010 Boundaries, Census 2000 Long Form in 2010 Boundaries and the 2010 ACS or the 2010 SF1. This combination of products is for researchers who want to do time series analysis from 1980 to 2010 at any of the geographic levels. This product is best suited for the researcher who wants to focus on trends from 1980 to 2010, and want to do the research at the most granular level (block group) or at one of the many larger geographies (Zip Code, MCD, County). The zip code level comparison can be especially important if you want to compare the data to an existing database of addresses with zip codes.

CensusCD 1990 Long Form in 2000 Boundaries
This product lets users access ALL of the 1990 Census data at ALL of the 2000 geographic levels for the 2000 Long Form (SF3) no block level data. The CensusCD 1990 Long Form in 2000 Boundaries is best suited for the researcher who is working with data sets in the 2000 boundaries and want to look at older data to determine trending patterns. It is ideal if you want block group, zip or town level data. If you want tract level data you may want to consider the NCDB. If you want the data normalized to 2010 boundaries than you should use the Census 1990 in 2010 Boundaries instead.

CensusCD 1980 in 2000 Boundaries
CensusCD 1980 is the first and only source of 1980 Census data that is expressed at all of the 2000 Long Form geographies. The CensusCD 1980 Long Form in 2000 Boundaries contains both the 1980 Long Form (STF-3) and Short Form (STF-1) datasets. It includes detailed demographic data about topics such as population, household structure, income, poverty, education level, employment, housing costs, immigration, and other variables.

Discounted Demographic Data Packages with Normalized Data:

We also have Demographic Data Packages that include both combinations of normalized and non-normalized datasets:

  1. Time Series Research Package
  2. This package is our most complete package with normalized and un-normalized census data from 1970, 1980, 1990, 2000, and now 2010. If you need instant access to all the data, this is the best discounted package that covers a broad range of our demographic data product line.

  3. Planners Package Plus
  4. This combination of products was put together for planners, developers, and marketing in mind. It covers 1990 and 2000 normalized data to 2010 boundaries, 2010 Census data, and the last piece is the current year population estimates and 5-year population projections.


        

GeoLytics, Inc.
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E-mail · Web http://www.geolytics.com · Demographic Resources