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2. Survey data collection - Wikipedia

   en.wikipedia.org/wiki/Survey_data_collection

   Invitations to online surveys. Due to the lack of sampling frames many online survey invitations are published in the form of an URL link on web sites or in other media, which leads to sample selection bias that is out of research control and to non-probability samples.

3. Online panel - Wikipedia

   en.wikipedia.org/wiki/Online_panel

   Online panel data (OPD) is widely used in market research. [3] [2] Other fields that contain prominent usage of online panel data include psychological, social, and medical research, as well as electoral studies. [2] Online panels were first utilized in academic journals in the late 1990s, though similar ideas had been proposed in the 1980s ...

4. Huffington Post / YouGov Public Opinion Polls

   data.huffingtonpost.com/yougov/methodology

   There are many non-sampling errors, common to all surveys, that can include effects due to question wording and misreporting by respondents. In a telephone survey, which begins with a random sample of phone numbers, such errors can occur due to those not covered by the sample, those who cannot be reached and those who do not respond to the survey.

5. Computer-assisted web interviewing - Wikipedia

   en.wikipedia.org/wiki/Computer-assisted_web...

   The design of an online questionnaire has a dramatic effect on the quality of data gathered. There are many factors in designing an online questionnaire; guidelines, available question formats, administration, quality and ethic issues should be reviewed. Online questionnaires should be seen as a sub-set of a wider-range of online research methods.

6. Survey sampling - Wikipedia

   en.wikipedia.org/wiki/Survey_sampling

   This type of sampling is common in non-probability market research surveys. Convenience Samples: The sample is composed of whatever persons can be most easily accessed to fill out the survey. In non-probability samples the relationship between the target population and the survey sample is immeasurable and potential bias is unknowable.

7. Open-access poll - Wikipedia

   en.wikipedia.org/wiki/Open-access_poll

   An open-access poll is a type of opinion poll in which a nonprobability sample of participants self-select into participation. The term includes call-in, mail-in, and some online polls. The most common examples of open-access polls ask people to phone a number, click a voting option on a website, or return a coupon cut from a newspaper. By ...