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7-study-design [2018/08/01 16:10] thorsten [7.2 Selection of units: census or sampling] |
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| __**7.1-7.6 are likely NOT relevant for passive surveillance components. But for any component design, readers should refer to 7.7 and 7.8.**__\\ \\ At this step, a surveillance designer should carefully consider how the study population is going to be selected. Should a census be performed (testing all animals in the target population) or is the population going to be subjected to some type of selective sampling strategy? Even if a census is to be performed, one may still want to consider some information in this section, such as the number of units in the population, as they are important to plan data collection. Moreover, if the target units are clustered (for instance animals clustered in farms), and a census at the top level will be performed (census of herds for instance), sampling within clusters (animals within farms) may still need to be designed.\\ \\ | __**7.1-7.6 are likely NOT relevant for passive surveillance components. But for any component design, readers should refer to 7.7 and 7.8.**__\\ \\ At this step, a surveillance designer should carefully consider how the study population is going to be selected. Should a census be performed (testing all animals in the target population) or is the population going to be subjected to some type of selective sampling strategy? Even if a census is to be performed, one may still want to consider some information in this section, such as the number of units in the population, as they are important to plan data collection. Moreover, if the target units are clustered (for instance animals clustered in farms), and a census at the top level will be performed (census of herds for instance), sampling within clusters (animals within farms) may still need to be designed.\\ \\ | ||
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| ===== 7.1 Point of sample collection ===== | ===== 7.1 Point of sample collection ===== | ||
| Addressed in the surveillance components overview. Please see page “**__[[/2-Surveillance-components|2- Overview of surveillance components]]__**”.\\ \\ | Addressed in the surveillance components overview. Please see page “**__[[/2-Surveillance-components|2- Overview of surveillance components]]__**”.\\ \\ | ||
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| ===== 7.2 Selection of units: census or sampling ===== | ===== 7.2 Selection of units: census or sampling ===== | ||
| \\ Sampling is the focus of the next section. However, the selection of units (whether all the target population defined can be reached - census - or a sampling design will be applied) should consider carefully the availability of a sampling frame. If it is not possible to identify and locate farms/herds/flocks, a surveillance designer should consider where else animals can be located and sampled.\\ \\ | \\ Sampling is the focus of the next section. However, the selection of units (whether all the target population defined can be reached - census - or a sampling design will be applied) should consider carefully the availability of a sampling frame. If it is not possible to identify and locate farms/herds/flocks, a surveillance designer should consider where else animals can be located and sampled.\\ \\ | ||