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Traditional Techniques For Sampling And Estimating Population Characteristics

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Traditional techniques for sampling and estimating population characteristics require that sample selection is done with a known probability. However, for a hard to reach population this is impossible. There is no list or registry from which to create a sampling frame or if there is a list, a random sampling can yield low number of eligible respondents since it’s often non-representative of the intended target population.1 In addition, it can be extremely difficult to locate members of this population due to social stigmas particularly in places with strict social norms that are dictated by religious practices or within a geographically wide spread small group.2 Examples of such populations are; the homeless, prostitutes, drug addicts, …show more content…

Chain referral a variant of snowballing is also often used interchangeably to represent snowballing in studies.5 This method relies on a series of participant referrals (multiple snowballing) to others who have experienced the intended characteristics by strategically accessing multiple networks to expand the reach of social network in other to obtain a representative estimate.6,7 Respondent driven sampling (RDS) Respondent driven sampling is much like snowballing method, that also relies on members who form interlinked social networks. Unlike a conventional probability sampling design, where each unit has a known and constant probability of selection, RDS is based on sampling design selection procedure that is affected by the discovered network in the population.8-11 RDS is predicated on the recognition that peers are better able to locate and recruit peers whom they know as members of a hard-to-reach social network. It can be implemented through the following 3 key steps: Planning Phase: The first step in this phase is familiarization of the extent of the networks in the population to be studied. Next step is identification of seeds chosen in a non-random fashion,

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