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E-research (Why transition from calling to online-polling may cause…

- - - - If survey is conducted using telephones respondents are more likely to answer in a socially desirable way
        
        Firstly, if there is a scale, there would be more extremely positive answers
        
        However, they usually try to avoid negative ones
- - - - This problem is successfully solved by using the randomly generated sequence of answers
  - - - Internet is more available for younger population while pensioneers usually prefer phones
      - Arguably the more prosperous part of the population will participate in online polling, while to answer phone call one just have to possess a telephone
      - In the countries with low coverage of Internet researchers are more likely to recruit urban dweller than respondents from rural areas, however, this is irrelevant for most European countries where more than 90% of population use Internet