3616 search results for "GIS"

Enron Email Corpus Topic Model Analysis Part 2 – This Time with Better regex

November 4, 2013
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Enron Email Corpus Topic Model Analysis Part 2 – This Time with Better regex

After posting my analysis of the Enron email corpus, I realized that the regex patterns I set up to capture and filter out the cautionary/privacy messages at the bottoms of peoples emails were not working.  Let’s have a look at … Continue reading →

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Generating d3js Motion Charts from rCharts

November 4, 2013
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Generating d3js Motion Charts from rCharts

Remember Gapminder, the animated motion chart popularised by Hans Rosling in his TED Talks and Joy of Stats TV programme? Well it’s back on TV this week in Don’t Panic – The Truth About Population, a compelling piece of OU/BBC co-produced stats theatre featuring Hans Rosling, and a Pepper’s Ghost illusion brought into the digital

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analyze the american national election studies (anes) with r

November 4, 2013
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on election days in the united states, the news media peppers its coverage with quick, dirty exit polls that allow them to make coarse statements like, "x% of demographic group y voted for candidate z."  the american national election studies are ...

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A Rather Nosy Topic Model Analysis of the Enron Email Corpus

November 3, 2013
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A Rather Nosy Topic Model Analysis of the Enron Email Corpus

Having only ever played with Latent Dirichlet Allocation using gensim in python, I was very interested to see a nice example of this kind of topic modelling in R.  Whenever I see a really cool analysis done, I get the … Continue reading →

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Simulating Abstract Art with R

November 3, 2013
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Simulating Abstract Art with R

Piet Mondrian Composition with Red, Blue, Black, Yellow, and Gray (1921): An example draw from my simulation function: We're in the midst of planning our spring course on Empirical Research Methods, and as a result, I've...

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Les k-plus prcoches voisins :Vite, il faut se la réapproprier…

November 2, 2013
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Les k-plus prcoches voisins :Vite, il faut se la réapproprier…

(This article was first published on Learning Data Science , and kindly contributed to R-bloggers) K-plus proches voisins K-plus proches voisins Fondamentaux La notion de voisinage d'un point est assez intuitive. Une définition simple serait : une zone de l'espace qui comprend ce point. C'est une notion centrale en mathématique, particulièrement en analyse lorsqu'on souhaite unifier la notion de...

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What’s new in Revolution R Enterprise? Webinar November 5

November 1, 2013
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Revolution R Enterprise 7 is a major update to Revolution Analytics' flagship predictive analytics software. Not only does it include the latest release of Open Source R (providing compatability with more than 6,000 user-contributed packages), it also adds in-Hadoop and in-database predictive modeling with big data, new statistical capabilities, and drag-and-drop workflow building via integration with Alteryx. You can...

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Efficiency Balanced Information Criterion for Item Selection

November 1, 2013
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Efficiency Balanced Information Criterion for Item Selection

# Han (2012) in the paper "An Efficiency Balanced Information Criterion # for Item Selection in Computerized Adaptive Testing" proposes a method# of evaluating potential items based on expected item potential information # as a function of maximum pote...

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Quarterback Wonderlic Scores by Institution (Academic) Strength

November 1, 2013
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Quarterback Wonderlic Scores by Institution (Academic) Strength

## geom_smooth: method="auto" and size of largest group is <1000, so using## loess. Use 'method = x' to change the smoothing method. I remember my dad telling me that when he was at Northwestern in the mid-70s, the team...

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Percolation Threshold: Including Next-Nearest Neighbours

November 1, 2013
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Percolation Threshold: Including Next-Nearest Neighbours

In my previous post about estimating the Percolation Threshold on a square lattice, I only considered flow from a given cell to its four nearest neighbours. It is a relatively simple matter to extend the recursive flow algorithm to include other configurations as well. Malarz and Galam (2005) considered the problem of percolation on a

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