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In the fall of 1977, when I was a couple of years out of college, I received an unexpected call from a friend, Dick Riley. He'd just landed a new job at a small publisher called Frederick Ungar, as the editor of a series of short critical monographs on de
68-95-99.7 rule - Wikipedia, the free encyclopedia
The 68-95-99.7 rule, or three sigma rule, or empirical rule, states that for a normal distribution, almost all values lie within 3 standard deviations of the mean.
About 68% of the values lie within 1 standard deviation of the mean. In statistical notati
Hairy Ball Theorem -- from Wolfram MathWorld
There does not exist an everywhere nonzero tangent vector field on the 2-sphere S^2. This implies that somewhere on the surface of the Earth, there is a point with zero horizontal wind velocity. The theorem can be generalized to the statement that the n-s
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This is a site for large data sets and the people who love them: the scrapers and crawlers who collect them, the academics and geeks who process them, the designers and artists who visualize them. It's a place where they can exchange tips and tricks, deve
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Numbrary is a free online service dedicated to finding, using and sharing numbers on the web.
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Market data is available from all US stock, futures and options exchanges, including regional exchanges and electronic communication networks (ECNs) via otFeed. For a list of exchanges, please click here.
wiki.dbpedia.org : About
DBpedia is a community effort to extract structured information from Wikipedia and to make this information available on the Web. DBpedia allows you to ask sophisticated queries against Wikipedia and to link other datasets on the Web to Wikipedia data.
TagCrowd - make your own tag cloud from any text
Word frequency visualization for URLs and files
Aptitude for Destruction, Volume 2: Case studies of Organizational Learning in Five Terrorist Groups
Continuing conflicts between violent groups and states generate an ever-present demand for higher-quality and more timely information to support operations to combat terrorism. Better ways are needed to understand how terrorist and insurgent groups adapt
Aptitude for Destruction, Volume 1: Organizational Learning in Terrorist Groups and Its Implications for Combating Terrorism
Continuing conflicts between violent groups and states generate an ever-present demand for higher-quality and more timely information to support operations to combat terrorism. Better ways are needed to understand how terrorist and insurgent groups adapt
Beyond al-Qaeda: Part 2, The Outer Rings of the Terrorist Universe
This book examines terrorist groups that, while not formally allied with al-Qaeda, pose a threat to Americans, at home and abroad, and to the security of our friends and allies. Although the temptation for policymakers is to set aside as less dangerous th
Beyond al-Qaeda: Part 1, The Global Jihadist Movement
Five years after September 11, 2001, al-Qaeda and other terrorist groups continue to threaten the lives and well being of Americans and the security of our friends and allies. This study first examines how al-Qaeda has changed since September 11. It then
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How To Analyze Data Using the Average | BetterExplained
The average is a simple term with several meanings. The type of average to use depends on whether you’re adding, multiplying, grouping or dividing work among the items in your set.
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