Rather than looking at the whole census, the two researchers relied on a sample of one person in 250.

两位研究员并不是调查整个统计，而是从每250人中抽取一人作为样本来研究。

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The sample was weighted by race and gender, based on census information.

样本家庭在人口信息的基础上，遍布了不同种族和性别。

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Citing unprecedented movements of the population to areas with heavy concentrations of armaments manufacturing and responding to the administration's orders, the Census Bureau unveiled a 1941 plan to conduct an annual sample census.

CNN: Why the huge interest in the 1940 Census?

The figures are not strictly comparable, because sample surveys show the sex ratio at birth, whereas the census gives it among infants up to the age of six.

ECONOMIST: India's skewed sex ratio: Seven brothers | The

This sample will allow the statisticians to gauge whether some particular group was miscounted in the original census.

ECONOMIST: Statistics