Assessment of Frame Quality in Agricultural Surveys in the Republic of Serbia

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• Assessment of Frame Quality in Agricultural
  Surveys in the Republic of Serbia
• N. Cvetkovic, O. Melovski Trpinac and D. Markovic
• Statistical Office of the Republic of Serbia
• Milana Rakica 5, 11000 Beograd
• Serbia and Montenegro
• ncvetkovic_at_statserb.sr.gov.yu,
• omelovski_trpinac_at_statserb.sr.gov.yu

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• In cooperation with Statistics Sweden a project
  whose goal is the assessment of frame quality in
  agricultural surveys has been initiated in the
  Statistical Office of the Republic of Serbia in
  2005.
• It is expected that the results of this project
  will provide information concerning quality of
  the existing frame and provide correction factors
  for the adjustment of estimates in agricultural
  statistics.

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• The frame issue
• Efficient and regularly updated frame does not
  exist
• There is no farm register
• Agricultural Census is not planned in the near
  future
• Need for changes in Agricultural statistical
  system (introduction of new surveys, etc.)

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• Existing frame
• Derived from Population Census 2002
• Currently used for annual livestock survey
• Not evaluated as a frame for agricultural surveys
• Not updated
• Reasons to expect coverage problems
• Need for frames for other agricultural surveys

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• Methodological approach
• Examples of statistics of interest
• Total number of agricultural holdings in EA (TA)
• Total number of livestock in EA (TL)
• Total area of cultivated land used by
  agricultural holdings in EA (TC)

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• We can compare the relations between different
  totals and calculate the coverage rates for the
  selected EAs
• for number of agricultural holdings in EA
  (TAPC/TA)
• for number of livestock in EA (TLPC/TL)
• for area of cultivated land used by household in
  EA (TCPC/TC)
• The coverage rates can be used to adjust the
  statistics produced in a survey using PC02 as the
  sampling frame.

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• Pilot Survey
• In order to test the methodology of the planned
  survey, a pilot survey was conducted in October
  2005.
• Nine EAs out of approx. 37000 EAs were selected
  for the survey.
• The survey was actually a census performed within
  a designated area and with a limited number of
  questions.

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• The most important information in the
  questionnaire are
• Identification of the household today
• Identification of the household in 2002
• Area of used arable land
• Livestock data

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• Matching of households
• Number of cases 203
• Matched 189
• same head of household 165
• changed head of household 24
• Not matched 14

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• Agricultural holding (AH) yes/no

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• Correction factors

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• Conclusions
• Pilot survey indicates undercoverage problems in
  the existing frame
• Specific problem seems to be undercoverage of AHs
  living in urban areas

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• Conclusions (contd)
• A full scale study is possible to perform with
  some minor adjustments of the methodology applied
  in the Pilot survey
• Such a study would provide correction factors for
  the production of more reliable agricultural
  statistics in existing and new agricultural
  surveys

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• Thank you
• for your attention

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