The Google site solves this problem by tracking the number of times people search for flu-related terms online.
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Maintaining situation awareness is critical to aviation safety, especially if there's a problem with the tracking technology.
The expectation that an index fund will get EXACTLY the return of the target index sets the stage for an interesting problem: Zero tracking error is achievable, but it comes at a very high price.
But Google faced a problem: Safari blocks most tracking by default.
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Given the liquidity of government bonds, tracking errors will be less of a problem with ETFs that represent government bond indices.
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.
Security experts focus on the "attribution problem" the challenge of identifying and tracking down the source of a cyberattack.
In the second part, another 59 subjects, wearing eye-tracking devices, watched short video clips of the problem-solving exercise.
Things have gone quiet through the Autumn, at least in the press, but chatting this week to psychiatrist Richard Peterson at Marketpsychdata, a specialist in tracking market sentiment, I began to sense the problem worsening.
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Although the company has recently modified its trending topics algorithm, spam is still a major problem one that happens to be adversely affecting its World Cup tracking site.
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He was an early and enthusiastic adapter of Compstat, a crime-tracking system implemented in 1994 that uses computer analysis to identify problem areas in order to deploy officers and make tactical adjustments to drive down crime.
He said there was a problem of overloaded containers and poor standards of lashing and stowing and called for automatic tracking beacons to be attached to every container.
Romney's campaign has acknowledged its problem with African American voters: Polls show blacks overwhelmingly prefer Obama -- a recent Gallup tracking poll showed just 5% of blacks supporting Romney, compared with 87% for the president.
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Even though steering-wheel locks, satellite tracking and immobilisers had helped to reduce car thefts, trade in stolen parts remained a problem.
But doctors and analysts say that even after years of tracking and debating pancreatitis cases, it is difficult to know whether Byetta or not is even causing the problem.
This is a problem for the security community in general because NAT enables cyber attackers to hide behind shared IP addresses, preventing those tracking them from being able to pinpoint their identity.
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