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عمومی::
زیر دامنه
If urban/rural populations are not stratified, they may instead be treated as sub-domains.
Sub-domains represent important sub-populations for which representative statistics are generated from the survey data, and thus each sub-domain should meet the minimum stratum sample size requirement (cfg_hh_per_stratum).
If either the urban or rural sub-domain does not include enough households, then the algorithm uses the ordered data frame to choose the next cell from the under-represented sub-domain (from any strata) and swaps out an already selected seed cell of the opposite sub-domain within that stratum.
This process repeats until the sample size requirement is met in each sub-domain (cfg_hh_per_stratum).
To implement sub-domain representation in gs_sample, set cfg_sample_rururb == 1 and define urban/rural boundaries (urban_raster).
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