Note: Data in this table are estimated from sample surveys.

注：本表数据为抽样调查数。

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Large-scale sample surveys are always undertaken with stratified multi-stage sampling.

大型抽样调查总是采用分层多阶段抽样。

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The data of total employees and employees by type of industry are estimated on the data collected from the sample surveys on labor.

全省从业人员人数及分三次产业从业人数根据劳动力抽样调查资料推算。

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From sample surveys, officials estimate the population at the end of 2009 to have been 1.33 billion.

ECONOMIST: China's ten-yearly census: The world's biggest headcount | The

For that, go to the sample surveys that India carries out more often.

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

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