February 26, 2019

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Collection of Data

                                         Collection of Data


  • Collection of data is the process of gathering data.


  • Sources of Collection of Data

  • Survey is a method of gathering information from individuals.


  • Precautions while drafting a questionnaire
  • Limited Number or Questions
  • Simple
  • Proper Order of the Questions
  • No Undesirable Questions
  • Non-Controversial
  • Pre-Testing Pilot Survey
  • Clear Instructions
  • Cross verification
  • Request for Return


  • Population or the Universe in statistics means totality of the items under study.


  • A Sample refers to a group or section of the population from which information is to be obtained.


  • Methods of Sampling





  • Sampling Errors and Non Sampling Errors


  • Census Method and Sample Method
Points of Difference Census Method Sampling Method
Sampling Error No sampling error present Sampling error may be present
Non – Sampling Error Non-sampling error  is higher Magnitude of non-sampling error is less
Expenses Costly Less costly
Time Time consuming Time saving
Investigators Large team of investigators is required Lesser number of investigators are required
Reliability and Accuracy Not very reliable More reliable
Type of Organisation Carried out by large organisations Carried out by small  organisations or even individuals


  • Reports and Publications of NSSO


  • Land and Livestock Holdings
  • Housing Conditions and Migration with special emphasis on slum dwellers
  • Employment and Unemployment status in India
  • Consumer Expenditure in India, including level and pattern of consumer expenditure of diverse categories or the people.
  • Sources of household income in India. 

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