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عمومی::
واحد نمونهگیری ثانویه
Then they grouped 1 km � 1 km grid cells within the selected PSUs to meet a minimum population threshold, and then randomly sampled one group of cells as a secondary sampling unit (SSU) in each PSU.
Finally, they manually segmented SSUs into dozens of areas with roughly equal population based on satellite imagery, and sampled one segment [10].
However, sample inclusion probabilities of PSUs and SSUs were sensitive to the size and zone of grid cells, which could have smoothed-out or emphasized population density depending on the distribution of the underlying population.
SSU:
secondary sampling unit
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