Presentation on theme: "1 American Community Survey Accessing 2010 ACS 1-Year Estimates for Hawaii Jerry Wong Information Services Specialist Los Angeles Regional Office U.S."— Presentation transcript:
1 American Community Survey Accessing 2010 ACS 1-Year Estimates for Hawaii Jerry Wong Information Services Specialist Los Angeles Regional Office U.S. Census Bureau 6911
2 What is the American Community Survey? A large, continuous survey that: is sent to 3 million resident addresses per year produces characteristics of population and housing produces estimates for small areas and small population groups Produces characteristics, not a population count Key component of the decennial census program
History and Timeline of the ACS 1981 1999 1990 2010 1994 Continuous measurement conceptualized Congress renewed interest in an alternative to the once-a-decade census Work began on what evolved into the ACS First operational test conducted in 4 sites Test sites expanded yearly to 36 counties in 26 states 1995 2005 N=165,000 housing units 2000 N=866,000 housing units in 1,239 counties N=3,000,000 housing units in all counties in 50 states, DC & PR Group Quarters added 2006 First 1-yr estimates released for areas 65,000+ 2008 First 3-yr estimates released for areas 20,000+ First 5-yr estimates release for areas below 20,000
4 Developing the ACS The ACS was developed to: 1.Focus the 2010 Census on improving the population count 2.Provide characteristic data more than once every 10 years to frame policy issues 3.Allow use of current data to respond to new trends
2010 Census and the ACS 2010 CensusACS U.S. population countU.S. population characteristics Short form onlyIncludes short form questions Only long form is for U.S. territories, except Puerto Rico Conducted in Puerto Rico “Usual residence” rule“Current residence” rule
7 Social Characteristics Education Marital Status Fertility Grandparent Caregivers Veterans Disability Status Place of Birth Citizenship Year of Entry Language Spoken at Home Ancestry / Tribal Affiliation
8 Economic Characteristics Income Benefits Employment Status Occupation Industry Commuting to Work Place of Work
10 Demographic Characteristics Sex Age Race Hispanic Origin
11 Recent Content Changes New Content 2008 1.Health Insurance Coverage 2.Veteran’s Service-connected Disability 3.Marital History 2009 1.Field of Undergraduate Degree Wording and format changes in 2008 to match Census 2010 questions
New 2010 Tables Fertility Table IDTable Title B13015 Women 15 To 50 Years Who Had A Birth In The Past 12 Months By Marital Status And Receipt Of Public Assistance In The Past 12 Months B13016 Women 15 To 50 Years Who Had A Birth In The Past 12 Months By Age
New 2010Tables Housing Characteristics Table IDTable Title B25028Tenure By Year Structure Built B25029Tenure By Year Householder Moved Into Unit B25090 Mortgage Status By Aggregate Real Estate Taxes Paid (Dollars) B25124Tenure By Household Size By Units In Structure B25125Tenure By Age Of Householder By Units In Structure B25126Tenure By Age Of Householder By Year Structure Built B25127Tenure By Year Structure Built By Units In Structure B25128 Tenure By Age Of Householder By Year Householder Moved Into Unit B25129 Tenure By Year Householder Moved Into Unit By Units In Structure
14 ACS Sample Design Sample is accumulated over TIME to produce lowest levels of geographic detail to replace census sample 5 years of data are required for areas and population groups with less than 20,000 population Sample cases selected from an updated Master Address File (MAF)
15 Sample Questionnaires mailed to about 1 in 480 addresses each month throughout the U.S. and Puerto Rico. 1 in 40 addresses per year (2.5% of the population). Average of 500-600 addresses per month per congressional district. Total of 3 million addresses each year, or 250,000 per month. Inclusion of population in group quarters beginning in 2006.
16 Target Population Resident population of the United States and Puerto Rico Living in housing units and group quarters (group quarters added in 2006) Current residents at the selected address
17 Methodology Sample includes about 3 million addresses each year Three modes of data collection –mail –phone –personal visit Data are collected continuously throughout the year
18 Period Estimates Describe the average characteristics over a specific period of time Contrast with point-in-time estimates -- Do not describe the characteristics on a specific date Period is 1 year, 3 years, or 5 years for ACS 1 Year Estimates Geographic areas with 65,000 or more population 3 Year Estimates Geographic areas with more than 20,000 population 5 Year Estimates All geographic areas down to the census tract & block group level
19 Geographic Boundaries Multiyear estimates are based on geographic boundaries as of January 1 of the last year in the multiyear period Example: 2007-2009 ACS estimates use boundaries as of Jan 1, 2009 Boundary Annexation Survey collects boundary changes Boundaries of other statistical areas will be updated every decade in conjunction with the decennial census 2010 Census boundaries will be used for data released in 2011
20 American Community Survey Geography The 2010 ACS data release marks the first time ACS will use 2010 tabulation geography for most statistical areas, the same definitions as the 2010 Census. Geographic areas whose definitions were updated for the 2010 Census include Census Designated Places (CDPs), census tracts, and block groups. 2010 ACS estimates for PUMAs and urban areas continue to use Census 2000 definitions.
ACS Data for Geographic Areas in Hawaii Geography 2010 1-Year Data 65,000+ Population 2009 1-Year Data 65,000+ Population 2007-2009 3-Year Data 20,000+ Population 2005-2009 5-Year Data including geographic levels below 20,000 Population StateHawaii Hawaii; In various metro or micropolitan statistical areas Hawaii; Urban Hawaii; Rural Hawaii Hawaii; In various metro or micropolitan statistical areas Hawaii; Urban Hawaii; Rural CountyHawaii County Honolulu County Kauai County Maui County Hawaii County Honolulu County Maui County Hawaii County Honolulu County Maui County Kauai County Hawaii County Honolulu County Maui County Kauai County Kalawao County PlaceUrban Honolulu CDPHonolulu CDP Hilo CDP Kahului CDP Kailua CDP Kaneohe CDP Kihei CDP Mililani Town CDP Pearl City CDP Waimalu CDP Waipahu CDP Hawaii County: 42 CDPs Honolulu County: 46 CDPs Kauai County: 22 CDPs Maui County: 21 CDPs
25 Estimates ACS data are estimates ACS data are not counts of the population or housing Population counts are produced from the decennial census - Counts are updated throughout the decade through the Population Estimates Program
26 Margin of Error (MOE) Margin of Error Definition: A measure of the precision of an estimate at a given level of confidence (90%, 95%, 99%) -- MOEs at the 90% confidence level for all published ACS estimates Confidence Interval Definition: A range that is expected to contain the population value of the characteristic with a known probability
28 Inflation Adjustment Dollar-valued data items are inflation adjusted to the most recent year for the period Income, rent, home value, and energy costs Adjusted using inflation factors based on the Consumer Price Index (CPI) Adjustment designed to put the data into dollars with equal purchasing power
29 Population Controls Estimates of housing units and people are controlled to the population estimates derived from the Population Estimates Program Multi-year estimates are controlled to the average of the individual year’s estimates for the period
Change in Population Controls The 2009 ACS and 2010 ACS 1-year estimates use different Census base years for the population estimates used in the ACS weighting. As a result, users should use caution when making comparisons across years. Specifically, estimates of the number of people in a given location (population size) are not strictly comparable between these two years. In general, the change to more current population estimates is not expected to have a meaningful impact in the percent distributions, rates, or ratios for non-demographic characteristics for many of the largest geographic areas. The Census Bureau is currently researching the effect on these distributions. For more details, visit the ACS Research Note Change in Population Controls.Change in Population Controls
ACS Data Products are Available Through the American FactFinder (AFF) on www.census.gov
57 Detailed Tables (Base Tables) Basic distributions of characteristics The foundation upon which other data products are built Show estimates with its margin of error. By adding and subtracting the margin of error from the point estimate, you produce the range around it called the confidence interval. (there is 90% certainty that the true answer lies within the listed upper and lower percentages).
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