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In page Sexual harassment:

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Despite its potential for bias, non-probability sampling may be used in cases where the research lacks funding or the number of participants available to sample from is small.[1] The selection of participants in non-probability sampling is nonrandom and is often the most convenient. Many of the early studies of sexual harassment such the survey by Working Women's Institute (1975) and the Redbook Survey; have relied on connivence/non-probability sampling to conduct their research.[1] The sampling was often done at conventions, meetings, or sent out in letters or magazines.[citation needed]