Problems
• Survey Sampling
Moving Universe (changing everyday)
Frame in moving universe
Non – referenced sites: URL Problem: This problem of "non-coverage" could be solved by a random dialing of phone numbers.
Respondent: Internet surveys, it is difficult to controlling respondents because we cannot know who is a respondent. If the questionnaire is sent by email, we will control respondents more easily. But email address does not cover the entire population. So the list of email addresses cannot be used, to a representative sample of the entire population.
An international multilingual multicultural environment: when the need for a separate geographical or language. The problem of language is the ability to answer questions in the survey reduced.
Field Work: When the survey form already and then select the sample. However, some practical issues still exist. A major problem associated with the following. (The format of the survey, Using search engines to define the sample frame and issues relating to the sample)
Quality of Frame: The most important problem of selecting a sample from the Internet. The sample frame " Representative " of the population that we want from the Internet, one way to solve this problem. Is to use a search engine, a framework for selecting the sample and to evaluate the properties of the search engines as well.