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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.
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.
The Living New Deal is a research project and online public archive documenting the scope and impact of the New Deal on Americans' lives and landscape. The Living New Deal relies on a network of Research Associates and other volunteers, including historians, teachers, students, artists, history buffs, librarians, journalists, and photographers ...
Libre Map Project: Online collection of all digital USGS 1:24K scale topographic maps (as well as various other GIS data) covering the United States, available as a free download. NPScape: United States Department of the Interior National Park Service NPScape is a landscape dynamics monitoring project that provides landscape-level data, tools ...
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 ...
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 ...