Methoden vergleichen

	Online Weighted Sampling	Quotenstichprobe
Fachgebiet	Umfragemethodik	Umfragemethodik
Familie	Process / pipeline	Process / pipeline
Entstehungsjahr	Late 1990s–2000s	1930s
Urheber	Survey methodology practitioners; systematized via probability-based online panels (e.g., Knowledge Networks, founded late 1990s)	Developed in market research and opinion polling, notably applied by George Gallup in the 1930s
Typ	Probability-adjusted online sampling technique	Non-probability sampling design
Wegweisende Quelle	Dillman, D. A., Smyth, J. D., & Christian, L. M. (2014). Internet, Phone, Mail, and Mixed-Mode Surveys: The Tailored Design Method (4th ed.). Wiley. ISBN: 978-1118456149	Moser, C. A., & Kalton, G. (1972). Survey Methods in Social Investigation (2nd ed.). Heinemann. ISBN: 978-0435827496
Aliasnamen	web-based weighted sampling, internet survey weighting, online panel weighting, weighted internet sampling	quota-controlled sampling, quota selection, non-probability quota sampling
Verwandt	4	5
Zusammenfassung	Online weighted sampling is the practice of recruiting respondents via internet platforms and then applying statistical weights to correct for unequal selection probabilities, coverage gaps, and differential non-response. It enables researchers to draw valid population inferences from web surveys by compensating for the structural biases inherent in online recruitment — including the fact that not all members of a target population have equal internet access or equal likelihood of joining a panel.	Quota sampling is a non-probability technique in which the researcher pre-specifies how many units to recruit from each subgroup (quota cell) defined by one or more control variables such as age, gender, or occupation. Interviewers or data collectors then use their own judgment to find and enroll participants until each cell is filled. The method guarantees the sample mirrors the population on the control variables but does not provide the randomness needed for classical statistical inference.