Integrated population-level data, such as those in this proposed COVID-19 segmentation framework, will be essential for this purpose. The availability of electronic data has never been greater.

With stratification, the larger population is broken down into subgroups—or strata—of a fairly homogeneous nature. Then, an equal number of group members is selected from each stratum.

Reining in world's largest population By Chen Zhiyong (China Daily) Updated: 2005-01-06 12:59. ... China will successively greet the arrival of the peak of its entire population strata.

Somalia last conducted a formal census in 1975, which recorded a total population of 4.2 million, Ige said. He said a second census took place in 1984 but was not published.

A stratified random sample divides the population into smaller groups, or strata, based on shared characteristics—thus ensuring that members from each subgroup are included in the data analysis.