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  1. May 2020
  2. www.nass.usda.gov www.nass.usda.gov
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    1. SamRose 07 May 2020
      food21 surveys probability nonprobability food abundance index statistics
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    nass.usda.gov/Education_and_Outreach/Understanding_Statistics/Statistical_Aspects_of_Surveys/survey_is_survey.pdf