However, the researchers said that despite a lower number of invasive tests, the heavier reliance of this method on chorionic villus sampling earlier in pregnancy could actually mean an increase in the number of healthy babies lost if the miscarriage rate using this method was closer to 2%.

BBC: Down's test miscarriage warning

The suppliers of bond ETFs get around the liquidity problem by using representative sampling, which simply means tracking only a sufficient number of bonds to represent an index.

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Republicans spent much of the 1997 appropriations season battling the administration over its plan to use statistical sampling, a technique that uses data from the traditional head count to estimate the number of those who did not respond to census takers.

CNN: By Juliana Gruenwald, CQ Staff Writer

The tallies were based on an internal sampling of accounts done by reviewers, and Facebook says the numbers may represent the actual number.

CNN: 83 million Facebook accounts are fakes and dupes