2259 search results for "MAP"

The Eye of the World as word cloud

December 16, 2012
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The Eye of the World as word cloud

The Eye of the World is the first book of Robert Jordan's Wheel of Time books. As the last of these books will be published soon, I was wondering if natural language processing can be used to examine books like these. For this purpose I downloaded a co...

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Multisite, multivariate genetic analysis: simulation and analysis

December 13, 2012
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Multisite, multivariate genetic analysis: simulation and analysis

The email wasn’t a challenge but a simple question: Is it possible to run a multivariate analysis in multiple sites? I was going to answer yes, of course, and leave it there but it would be a cruel, non-satisfying answer. … Continue reading →

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Trading with SVMs: Performance

December 13, 2012
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Trading with SVMs: Performance

To get a feeling of SVM performance in trading, I run different setups on the S&P 500 historical data from … the 50s. The main motif behind using this decade was to decide what parameters to vary and what to keep steady prior to running the most important tests. Treat it as an “in-sample” test

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In case you missed it: November 2012 Roundup

December 12, 2012
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In case you missed them, here are some articles from November of particular interest to R users. In the webinar "Real-Time Predictive Analytics with Big Data", I showed how R fits into a real-time production system. R package developer Yihui Xie shares his favorite software and hardware in an interview with The Setup. Hadley Wickham created a handy tutorial...

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Using R to refine the search result of www.finn.no

December 12, 2012
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Using R to refine the search result of www.finn.no

www.finn.no is the most popular website in Norway. It supplies a lot of features, such as booking flight tickets, finding job, renting and sales of houses, cars and other properties, etc. I just have some experience with it. I sold and bought cars, apartment and some other stuff. It’s very convenient. But just one thing I feel not convenient:...

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Videos from Coursera’s four week course in R

December 11, 2012
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Coursera's Computing for Data Analysis course on R is now over, with four weeks of free, in-depth training on the R language. While you'll have to wait for the next installment of the course to participate in the full online learning experience, you can still view the lecture videos, courtesy of course presenter Roger Peng's YouTube page. The course...

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Visualizing Baltimore 3.1: Crime and Vacant Properties, Neighborhood Level, Bit More Polished

December 11, 2012
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Visualizing Baltimore 3.1: Crime and Vacant Properties, Neighborhood Level, Bit More Polished

Redos of the plots from this post: Bit more communicative, though the overplotting is a bit annoying. Code: ## gis libraries library(spBayes) library(MBA) library(geoR) library(fields) library(sp) library(maptools) library(rgdal) library(classInt) library(lattice) library(xtable) library(spatstat) library(splancs)   ## Other packages library(ggplot2) library(foreign) library(stringr)...

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R Tip: Avoid using T and F as synonyms for TRUE and FALSE

December 11, 2012
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By default when you start R, T and F are defined as TRUE and FALSE. When I review other people’s code, I often see functions defined with arguments set to these values by default. This is a very bad idea. … Continue reading →

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Four years of the Revolutions Blog

December 10, 2012
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Yesterday was the fourth anniversary of the Revolutions blog. Our first post was way back on December 9, 2008, and in the four years since we've been regularly posting about R, open source, statistics, big data, data science and other random things that happened to catch our eye. In fact, there have been 1488 posts published in the last...

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Visualizing Baltimore 3: Crime and Vacant Properties, Neighborhood Level

December 10, 2012
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Visualizing Baltimore 3: Crime and Vacant Properties, Neighborhood Level

A few quick plots of West Baltimore neighborhoods, first Sandtown-Winchester: and Harlem Park: These aren’t very polished, I’ll put up better versions. Here’s the code for those that want it: ## gis libraries library(spBayes) library(MBA) library(geoR) library(fields) library(sp) library(maptools) library(rgdal)...

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