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Each stratum was masked by the same forest mask described above.
Each stratum is considered as an independent sub-population in which systematic sampling is applied.
Each stratum was divided into 5 naturally occurring clusters.
Each stratum has to recruit at least 270 patients.
An observation point is then placed inside each stratum.
…into relatively homogeneous groups called strata and a simple random sample is selected from each stratum.
A side benefit of this method is that inferences about the subpopulation represented by each stratum can also be made.
In total 120 sites were surveyed, with 10 replicates in each stratum.
In each stratum field plots are assessed.
We laid out plots in systematic grids in each stratum.
Simple random sampling was assumed within each stratum.
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