| Census > ACS Main > Access Data > Data Product Changes for 2007 |
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The 2007 ACS data release includes several changes to the 2006 ACS data products. In addition, one data product, formerly known as the “multiyear profiles”, is being re-introduced under the new name “comparison profiles” after being suspended for two years.
The data products available for the 2005-2007 ACS Three-Year Estimates are the same data products available for the 2007 ACS One-Year Estimates with the exception of Ranking Tables and Comparison Profiles. Ranking Tables and Comparison Profiles are only available for ACS One-Year Estimates.
Selected Population Profiles are now available for approximately 100 countries and regions of birth groups, in addition to the race, ancestry, and ethnic groups that were released in previous years.
Comparison Profiles show data side-by-side from the 2006 ACS and the 2007 ACS, indicating where there is a statistically significant difference between these two sets of estimates. An * in the statistical significance column of the comparison profile indicates that the 2006 ACS estimate is significantly different (at a 90% confidence level) from the 2007 ACS estimate. A 'c' indicates the estimates for that year and the current year are both controlled; a statistical test is not appropriate. The comparison profiles are available for one-year estimates only.
Quality measures are produced annually to accompany each ACS data release. These statistics are provided to help users get a better sense and understanding of the quality of the data. Ten new detailed tables have been created that include specific measures of survey quality. The table identifier and title for each of these tables is listed below.
| B98001 | UNWEIGHTED HOUSING UNIT SAMPLE | ||
| B98002 | UNWEIGHTED GROUP QUARTERS POPULATION SAMPLE | ||
| B98011 | HOUSING UNIT COVERAGE RATE | ||
| B98012 | TOTAL POPULATION COVERAGE RATE BY SEX | ||
| B98013 | TOTAL POPULATION COVERAGE RATE BY WEIGHTING RACE AND HISPANIC OR LATINO GROUPS | ||
| B98014 | GROUP QUARTERS POPULATION COVERAGE RATE | ||
| B98021 | HOUSING UNIT RESPONSE AND NONRESPONSE RATES WITH REASONS FOR NONINTERVIEWS | ||
| B98022 | GROUP QUARTERS POPULATION RESPONSE AND NONRESPONSE RATES WITH REASONS FOR NONINTERVIEWS | ||
| B98031 | OVERALL PERSON CHARACTERISTIC IMPUTATION RATE | ||
| B98032 | OVERALL HOUSING UNIT CHARACTERISTIC IMPUTATION RATE |
State and national-level quality measures were previously published on the ACS website but are now accessible from the American FactFinder in the form of detailed tables. Users can learn more about Quality Measure tables by going to the 2007 Accuracy of the Data document located at http://www.census.gov/acs/www/UseData/Accuracy/Accuracy1.htm
These detailed tables include estimates based on outmigration. The estimates are similar to those available for the geographic mobility tables for current residence but instead of using the current location of the respondent they use the location of the respondent one year ago. Forty-two new tables will be available this year. These new tables allows one to determine the characteristics of persons who LEFT a specified geographic area in the past year, as well as the characteristics of those who stayed in that area.
In the 2006 ACS the Selected Population Profiles were only released for geographic areas with a total population of at least 1 million. This population threshold has been reduced to 500,000. This change results in the release of Selected Population Profiles for all congressional districts. As was true in the 2006 ACS, Selected Population Profiles that are based on one-year estimates are only released for selected population groups with a minimum estimated size of 65,000. The three-year Selected Population Profiles will support selected populations with a minimum estimated size of 20,000. Four new estimates were added to the Selected Population Profile identifying the number of races reported.
In addition to the estimate and margin of error of the estimate, the data profiles will include estimates in the form of percentages and the margins of error associated with those percentages.
Twelve Detailed Tables were removed. However, nine of the removed detailed tables (B13004A-I. Women 15-50 Years Who Had a Birth in the Past 12 Months by Marital Status –iterated by race) were replaced by B13002A-I Women 15-50 Years Who Had a Birth in the Past 12 Months by Marital Status by Age. Three tables were deleted:
Collapsed versions were added for fifty-nine detailed tables.
In the 2006 ACS, Group Quarters table S2601C. Characteristics of the Group Quarters Population in the United States was only available for selected states. The 2005-2007 ACS Three-Year Estimates allow this Subject Table to be produced for all states, the District of Columbia, and Puerto Rico.
The only changes to this data product are for the 2005-2007 period. The American Indian Area for the three-year table now includes the following three geographic entities
The 1996 through 2004 ACS data can no longer be accessed as Data Sets in American FactFinder nor from the ACS website. All of the ACS 2000-2004 data products, except Congressional Web Page and Fact Sheets, were removed from the American FactFinder and archived to the FTP site which can be accessed from the ACS Data Sets page on American FactFinder under the “Other Resources” heading. ACS 2000–2004 archival files follow a consistent format with ACS 1996 - 1999 archives. All files are in .CSV format, in which data files are comma delimited, and metadata files are hash delimited.