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National Information Center on Health Services Research and Health Care Technology (NICHSR)

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They do not include:
  • People who do not live in households
  • Those living in institutions.
  • Severely disabled people living in nursing homes and
  • Those who are in prison.
They are expensive because each interview requires recruitment of the respondent.

Inferences from them are limited by:
  • Omitting some households from the frame for the sample
  • Households that refuse to participate or cannot be contacted and
  • Persons who provide incomplete information
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