Nygis october2010
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  • Demographics is the “who”, Psychographics is the “why”

Nygis october2010 Nygis october2010 Presentation Transcript

  • Bob Scardamalia RLS Demographics, Inc.RLS Demographics, Inc. October 25, 2010
  •  Census Data – The Changing Landscape  The American Community Survey  Buyer Beware  Making Sense of it AllOctober 25, 2010 RLS Demographics, Inc.
  •  A Basic Headcount  Fulfill Constitutional Requirements  Fulfill Requirements of the Voting Rights Act  Address Based Enumeration from the Master Address File  Short and Simple Questionnaire  Traditionally Provided Socio-Economic and Housing CharacteristicsOctober 25, 2010 RLS Demographics, Inc.
  •  Income  Education  Employment  Travel to Work  Language Spoken  Disability  Housing Value/RentOctober 25, 2010 RLS Demographics, Inc.
  •  A LargeContinuous Survey  250,000 Households Every Month  Drawn from the Master Address File  Provides “Annual” Estimates  1-year, 3-year, and 5-year averages  Provided for ALL Census Geographies Down to the Block Group Level  Similar But Not the Same as the CensusOctober 25, 2010 RLS Demographics, Inc.
  • Total January InterviewsOctober 25, 2010 RLS Demographics, Inc.
  • Data products are released in the year following the single-yearor the last year of the multi-year period in which data arecollected. October 25, 2010 RLS Demographics, Inc.
  • Fundamentally Different Data Collection Instruments  Reference Period  The Census is a point in time count (4-1-10); the ACS accumulates 12 months of surveys for a calendar year estimate  CAN NOT think of annual ACS estimates as centered within a specific period (annual, 3-year, 5-year)  Not all data is from that calendar year though – income refers to “the last 12 months…”  Sample Size  Smaller than the traditional Census Long Form  Sampling rate declines as the nation growsOctober 12, 2010 RLS Demographics, Inc.
  • Conceptual Differences  Residency Rules  Decennial Census – “Usual Place of Residence”  ACS – resident for 2+ months (seasonality)  ACS – excludes some group quarters  Sample Weighting  Census – small sample weighting areas  ACS – county population estimates  Data Allocation  Census – high rates  ACS – better, trained interviewersOctober 12, 2010 RLS Demographics, Inc.
  • Now it Gets Tricky!!  Period Rather than Point Estimates  Fire Hose of Data EVERY year  Multiple Numbers EACH Year for the Same Area  2010 release for areas of 65,000 or more  1-year estimate (2009 collection)  3-year estimate (2007-2009 collection)  5-year estimate (2005-2009 collection)  Areas of 20,000 to 65,000  3-year estimate (2007-2009 collection)  5-year estimate (2005-2009 collection)  Areas under 20,000  5-year estimate ONLY (2005-2009 collection)October 12, 2010 RLS Demographics, Inc.
  • October 12, 2010 RLS Demographics, Inc.
  • October 12, 2010 RLS Demographics, Inc.
  •  Geography  Current ACS geography reflects the 2000 Census  December release of tract data will be 2000 Census tracts  2010 Census release of tract data in March 2011 will be new 2010 geographyOctober 12, 2010 RLS Demographics, Inc.
  •  Make sure geographic boundaries haven’t changed  Especially for Census tracts and block groups  Compare similar period estimates  Don’t compare a 1-year estimate for one area to a 3-year estimate for a different area  Use non-overlapping periods when possible  Compare 2005-2007 with 2008-2010  ACS – better, trained interviewers  Determine if you need currency or accuracy  1-year estimates have greater margins of errorOctober 12, 2010 RLS Demographics, Inc.
  • P.O. Box 160 Rensselaerville, NY 12147 (518) 703-0724 (cell) (518) 797-3163 (home) bob@rlsdemographics.comOctober 12, 2010 RLS Demographics, Inc.