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Math

Statistical Analysis of Terrorism 265

Harperdog sends in a Miller-McCune story about Aaron Clauset, a researcher whose studies on the statistics and patterns that arise from large numbers of terrorist attacks could help governments better prepare for such conflicts and reduce uncertainty about their frequency and magnitude. Quoting: "After mapping tens of thousands of global terrorism incidents, he and his collaborators have discovered that terrorism can be described by what mathematicians call a power law. ... Using this power law relationship — called 'scale invariance' — the risk of a large attack can be estimated by studying the frequency of small attacks. It’s a calculation that turns the usual thinking about terrorism on its head. 'The conventional viewpoint has been there is "little terrorism" and "big terrorism," and little terrorism doesn't tell you anything about big terrorism,' Clauset explains. 'The power law says that's not true.' Massive acts of violence, like 9/11 or the devastating 1995 bombing of the US embassy in Nairobi, obey the same statistical rules as a small-scale IED attack that kills no one, Clauset's work suggests. 'The power law form gives you a very simple extrapolation rule for statistically connecting the two,' he says."

Comment Total cost per drive + redundancy (Score 1) 362

More goes into an enterprise disk drive than the cost of the hardware. Do you want backups? Do you want fast access? Do you need a warranty? Do you want RAID?

On the other hand, one really slick move that Google could have made would be to index unique messages. If you and I both get the same message, it could be stored once on the server, rather than twice.

If you figure that 50% of email is unique, then that's at most 500mb of content you have to store for a given user. If you figure that 1% of email is shared among 1000 users (e.g. securityfocus mail), then that 1k email is going to *appear* to be 1mb spread out over 1000 users' inboxes.

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