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Panel sampling is the method of first selecting a group of participants through a random sampling method and then asking that group for (potentially the same) information several times over a period of time. Therefore, each participant is interviewed at two or more time points; each period of data collection is called a "wave".
Focus groups first started in the 1940s as a research method in the context of market research concerning radio soap operas. [9] During the Second World War, Robert K. Merton set out to analyze the effectiveness of propaganda with the use of focus groups. [10]
During, the 1930s and 1940s, many of the data collection methods, probability sampling methods, survey methods, questionnaire design and key metrics were developed. By the 1930s, Ernest Dichter was pioneering the focus group method of qualitative research.
In sociology and statistics research, snowball sampling [1] (or chain sampling, chain-referral sampling, referral sampling [2] [3]) is a nonprobability sampling technique where existing study subjects recruit future subjects from among their acquaintances. Thus the sample group is said to grow like a rolling snowball.
In consumer research, a range of qualitative methods are used, particularly in-depth interviews, focus groups and ethnographic observation. [8] In B2B research, focus groups and ethnographic observation are used far less frequently due to the nature of business decision-makers, and in-depth interviews are most frequently used in B2B research: [9]
Bias in surveys is undesirable, but often unavoidable. The major types of bias that may occur in the sampling process are: Non-response bias: When individuals or households selected in the survey sample cannot or will not complete the survey there is the potential for bias to result from this non-response.
[5] According to Powell et al., a group of individuals selected and gathered by researchers to discuss and comment on, from personal experience, the topic that is the subject of the research form a focus-group. [6] Some of the features of focus-group discussions include each member's participation, a number of consecutive meetings, common ...
Survey methodology is "the study of survey methods". [1] As a field of applied statistics concentrating on human-research surveys, survey methodology studies the sampling of individual units from a population and associated techniques of survey data collection, such as questionnaire construction and methods for improving the number and accuracy of responses to surveys.