SIPP and''Slide The Implications of Eliminating the SIPP for Disability Research

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 SIPP and..Slide? The Implications of
Eliminating the SIPP for Disability Research

• David Wittenburg

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Current Status of the SIPP

• Status of 2007 SIPP is uncertain
• Presidents FY 2007 budget would eliminate 2007
  SIPP (March 2006)
• Reallocate money to new data efforts
• House appropriations added 10 million to extend
  the SIPP (June 2006)
• Senate proposed a 50 million cut to the Census
  budget (July 2006)

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Key Questions for Discussion

• What does the current SIPP offer for disability
  research?
• Will other surveys be able to fill in the gaps?

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Organization

• Data Description
• Advantages and Limitations
• Examples of Disability Research Using the SIPP
• Conclusion

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Data Description
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Overview

• Purpose
• Longitudinal income and program participation
  information
• 2.5 years in length
• Several SIPP panels available (1984-2004)
• Sampling frame
• Adults over age 15
• 45,000 households (2004 SIPP)
• Questionnaire
• Core (every interview)
• Topical Module (select interviews)

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SIPP and Disability Research

• Core questionnaire
• Work limitations
• Topical module
• Health and functional limitations
• Work disability history
• Medical expenses

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Disability Questions

• Participation restrictions
• Work limitations
• Instrumental activities of daily living (IADLs)
• going outside the home, keeping track of money or
  bills, preparing meals, doing light housework,
  using the telephone

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Disability Questions (continued)

• Activity limitations
• Activities of daily living (ADLs)
• inside the home, getting in/out of a bed/chair,
  bathing, dressing, eating, toileting
• Functional limitations
• seeing, hearing, speaking, lifting, and carrying,
  using stairs, walking

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Disability Questions (continued)

• Impairments
• Physical
• Mental
• Sensory
• Other
• Accommodations Use of wheelchairs, crutches,
  canes, or walkers

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Advantages and Limitations for Research
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Advantages for Research

• Large sample
• Longitudinal information over 2.5 year period
• Detailed income and program participation
  information
• Detailed health and functional limitations
  information
• Ability to link to administrative data

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Limitations

• Reliability of certain questions
• Questionnaire changes in the SIPP Creates
  challenges in making comparisons across panels
• Caution must be used in making certain
  cross-panel comparisons

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Examples of Disability Research Using the SIPP
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SIPP Disability Estimates 2001 SIPP
Source Wittenburg and Nelson 2006, 2001 SIPP
Panel files, Wave 5 Topical Module
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Examples of Disability Research

• Prevalence
• Adler (1991), McNeil (2000)
• Comparative analysis
• Wittenburg and Nelson (2006)
• Policy changes (e.g., ADA)
• DeLeire (2000), Hotchkiss (2003), and Kruse and
  Schur (2002)

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Examples of Disability Research (continued)

• Disability dynamics
• Hollenbeck and Kimmel (2001)
• Program dynamics
• Stapleton, Wittenburg and Maag (2005), Rupp and
  Davies (2004), Davies et al. (2001)
• Income dynamics
• She and Livermore (2006)
• Child disability
• Lee, Sills, and Oh (2002)
• Microsimulation modeling
• Models DYNASIM, MINT

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Conclusions
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Can the SIPP be Replaced for Disability Data

• Major gap in longitudinal income and program data
• Loss of extensive battery of disability questions
• Limits opportunities for comparison analysis
• Options to fill in the gap are limited. E.g.
• CPS Cross-sectional survey, limited disability
  information
• NHIS Cross-sectional survey, limited income
  information
• PSID Longitudinal survey, limited disability
  information/sample size