2729 search results for "GIS"

A Word Cloud with Spatial Meaning

December 7, 2011
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A Word Cloud with Spatial Meaning

..Some time ago I did a word cloud for representing a Google Scholar search result. Tal Galili pointed me at a post by Drew Conway that expanded on the topic of word clouds lacking spatial meaning. In fact the spatial ordering of words in a word cloud ...

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World Since June 2008

December 6, 2011
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World Since June 2008

For a client meeting, I struggled with how best to illustrate world markets since June 2008.  I used R to produce this, but I’m still not completely satisfied. Anyone have suggestions to improve? From TimelyPortfolio What I thought was inte...

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Judging panel for Applications of R in Business contest

December 6, 2011
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Now that the final submissions are in for the Applications of R in Business contest, it's time to announce the judging panel who will select the winners for $20,000 in cash prizes from Revolution Analytics. They are: Edd Dumbill, technologist and writer for O'Reilly Media David Menninger, VP & Research Director at Ventana Research Steve Miller, technology writer and...

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My Favorite Graphs

December 5, 2011
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My Favorite Graphs

The important criterion for a graph is not simply how fast we can see a result; rather it is whether through the use of the graph we can see something that would have been harder to see otherwise or that could not have been seen at all. – William Cleveland, The Elements of Graphing Data, Related posts:

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A pure R poker hand evaluator

December 5, 2011
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A pure R poker hand evaluator

There's already a lot of great posts out there about poker hand evaluators, so I'll keep this short.  Kenneth J. Shackleton recently released a very slick 5-card and 7-card poker hand evaluator called SpecialK.  This evaluator is li...

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From datasets to algorithms in R

December 5, 2011
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Many statistical algorithms are taught and implemented in terms of linear algebra. Statistical packages often borrow heavily from optimized linear algebra libraries such as LINPACK, LAPACK, or BLAS. When implementing these algorithms in systems such as Octave or MATLAB, it is up to you to translate the data from the use case terms (factors, categories, numerical variables)...

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Improved Moving Average?

December 4, 2011
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Improved Moving Average?

When @quantfblog started following me on Twitter, I was delighted to discover their papers Papailias, Fotis and Thomakos, Dimitrios D., An Improved Moving Average Technical Trading Rule (September 11, 2011). Available at SSRN: http://ssrn.com/abstract...

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On the (statistical) road, workshops and R

December 3, 2011
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On the (statistical) road, workshops and R

Things have been a bit quiet at Quantum Forest during the last ten days. Last Monday (Sunday for most readers) I flew to Australia to attend a couple of one-day workshops; one on spatial analysis (in Sydney) and another one … Continue reading →

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Working with Wisconsin Voter Data in Access 2007; Analysis with R.

December 2, 2011
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Computer Assisted Reporting This technical note describes manipulation/analysis of Wisconsin voter registration data from June 2011. Wisconsin voter registration data can be purchased from the Wisconsin Government Accountability Board for $12,500, whic...

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Is Drawdown the Biggest Determinant of System Success?

December 1, 2011
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Is Drawdown the Biggest Determinant of System Success?

In all my system development, I still have not been able to determine what universal underlying conditions significantly improve a system’s chances of outperforming buy-and-hold.  Also, I have found very little discussion, so maybe R with some h...

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