3575 search results for "GIS"

Guardian Words: Visualized

March 15, 2014
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Andy Kirk (@visualisingdata) & Lynn Cherny (@arnicas) tweeted about the Guardian Word Count service/archive site, lamenting the lack of visualizations: Want to know num of words written in each day's Guardian paper by section + approx reading time? http://t.co/wP4W1EzUsx via @bengoldacre— Andy Kirk (@visualisingdata) March 15, 2014 This gave me a chance to bust out

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How to use Bioconductor to find empirical evidence in support of π being a normal number

March 14, 2014
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How to use Bioconductor to find empirical evidence in support of π being a normal number

Happy π day everybody! I wanted to write some simple code (included below) to the test parallelization capabilities of my  new cluster. So, in honor of  π day, I decided to check for evidence that π is a normal number. A … Continue reading →

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Using Genetic Algorithms in Quantitative Trading

March 14, 2014
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The question one should always asked him/herself when using technical indicators is what would be an objective criteria to select indicators parameters (e.g., why using a 14 days RSI rather than 15 or 20 days?). Genetic algorithms (GA) are well suited tools to answer that question. In this post I’ll show you how to set

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Bayesian Search Models

March 13, 2014
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Bayesian Search Models

Bayesian Search Theory The US had a pretty big problem on their hands in 1966. Two planes had hit each other during a in-flight refueling and crashed. Normally, this would be an unfortunate thing and terrible for the families of those involved in the crash but otherwise fairly limited...

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The Lonely Acacia Is Rocked By The Wind Of The African Night

March 13, 2014
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The Lonely Acacia Is Rocked By The Wind Of The African Night

If you can walk you can dance. If you can talk you can sing (Zimbabwe Proverb) There are two things in this picture I would like to emphasise. First one is that everything is made using points and lines. The moon is an enormous point, stars are three small nested points and the tree is

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Morning coffee: scripting language

March 13, 2014
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Morning coffee: scripting language

Several people have asked: what scripting language should biologists learn if they are interested in doing a little larger-scale data analysis and have never programmed before? I’m not an expert, but these are the kinds of things I tend to say: The language is not so important; the same principles apply everywhere. Use what your

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Software Carpentry at UVA, Redux

March 12, 2014
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Software Carpentry at UVA, Redux

Software Carpentry is an international collaboration backed by Mozilla and the Sloan Foundation comprising a team of volunteers that teach computational competence and basic programming skills to scientists. In addition to a suite of online lessons, ...

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Generalized Linear Mixed Models in Ecology and in R

March 12, 2014
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Generalized Linear Mixed Models in Ecology and in R

I had a nice workshop two weeks ago in Tübingen (south-germany) concerning Generalized Linear Mixed Models (GLMM) in R. The course was given by two ecologist: Dr. Pius and Fränzi Korner-Nievergelt  that spend now half of their time doing statistical consulting (http://www.oikostat.ch/navigation_engl.htm). Nice reference concerning GLMMs are: the 2009 Bolker paper (paper),  the 2007 book

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Call for Presentations for the EARL Conference, London Sep 2014

March 11, 2014
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Call for Presentations for the EARL Conference, London Sep 2014

Mango Solutions invite presentations for the EARL (Effective Applications of the R Language) Conference which will be held in London on the 16-17th September 2014. The EARL Conference provides an opportunity for those using and developing the open source statistical programming language R to share and discuss their practices of the R Language. The conference will focus primarily on...

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Confounding & collinearity

March 11, 2014
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Confounding & collinearity

(This article was first published on MATHEMATICS IN MEDICINE, and kindly contributed to R-bloggers) Confounding and collinearity Introduction In this blog article, I will discuss about the bias introduced in estimation of coefficient of a given explanatory variable due to the presence of confounding factors. After that, I will try to demonstrate about the effect of variable collinearity on...

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