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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According to some sample surveys, visitors tend to think, open the web faster higher quality, more reliable and more interesting.

根据一些抽样调查，访问者倾向于认为，打开速度较快的网站质量更高，更可信，也更有趣。

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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