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The departure from expectation of the GCP data collected on
September 11 2001 is striking. The strong and persistent cumulative
deviation of the composite mean across the EGGS supports a
conclusion that the network responded to the events of
that day. Here we present an animated display of the data recorded
during nine days surrounding 9/11.
You can watch the "random walk" beginning on 7 September and
continuing through the 15th.
On the 11th, a strong trend begins that lasts for two days
before returning to the expected random walk.
The slope and duration of that trend are unique in the GCP database.
The version in place has timing set to show the 9-day period in about 20
seconds. But the display will be constrained by the speed of your processor.
Use your browser's back and forward buttons to play again.
(Note: the animated clock is not exactly synchronized, but the x-axis
time labels are correct.)
Author: Greg Nelson, 19 Sept 2003
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