2738 search results for "GIS"

Climate: Misspecified

December 4, 2012
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Climate: Misspecified

I'm usually quite a big fan of the content syndicated on R-Bloggers (as this post is), but I came across a post yesterday that was as statistically misguided as it was provocative. In this post, entitled "The Surprisingly Weak Case for Global Warming," the author (Matt Asher) claims that the trend toward hotter average global temperatures over the last

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An update on Shiny

December 4, 2012
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An update on Shiny

Last month we released Shiny, our new R package for creating interactive web applications. The response from the community has been extremely encouraging–we’ve received a lot of great feedback that has helped us to make significant improvements to the framework already! Shiny 0.2.3 on CRAN Starting with Shiny 0.2.3, you can install the latest stable

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More Shiny Goodness – Tinkering With the Ergast Motor Racing Data API

December 4, 2012
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More Shiny Goodness – Tinkering With the Ergast Motor Racing Data API

I had a bit of a play with Shiny over the weekend, using the Ergast Motor Racing Data API and the magical Shiny library for R, that makes building interactive, browser based applications around R a breeze. As this is just a quick heads-up/review post, I’ll largely limit myself to a few screenshots. When I

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Reading/Writing Stata (.dta) files with Foreign

December 4, 2012
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Reading/Writing Stata (.dta) files with Foreign

Oftentimes we find ourselves collaborating with others who might not use R or prefer to use Stata to clean and manage their data. Luckily, there is the foreign package that permits handling data of different types (SAS, SPSS, Stata, etc.) within the R...

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Tutorial: How to make NYT-style bar charts with R

December 3, 2012
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Tutorial: How to make NYT-style bar charts with R

New York Times columnist Charles Blow needed a chart to accompany his op-ed piece Lincoln, Liberty and Two Americas (about one-party control in state legislatures). So he turned to resident graphic editor Kevin Quealy, who found the source data and used R to create the chart below: If you'd like to create similar charts yourself, Kevin provides a useful...

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The surprisingly weak case for global warming

December 3, 2012
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The surprisingly weak case for global warming

I welcome your thoughts on this post, but please read through to the end before commenting. Also, you’ll find the related code (in R) at the end. For those new to this blog, you may be taken aback (though hopefully not bored or shocked!) by how I expose my full process and reasoning. This is

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Google analytics data extraction in R

December 3, 2012
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Google analytics data extraction in R

Unlike other posts on this blog this particular post is more focused on coding using R so audience with the developer mindset would like it more than pure business analysts. My goal is to describe an alternate method to use to extract the data from Google Analytics via API into R. I have been using

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Rolling means (and other functions) with zoo

December 2, 2012
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Rolling means (and other functions) with zoo

The zoo package is designed for use with (potentially irregular) time series data. It is widely used for any number of applications, but among its most frequently useful functions are the roll* functions, such as rollmean, rollmedian, rollmax, rollapp...

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Using XML to grab tables from the web

December 1, 2012
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Using XML to grab tables from the web

We’re going to try, this December, to bring you an “Advent CalendaR,” for each of the 24 days leading up to Christmas. Each day, our hope is to unwrap a useful R package to show you a useful or interesting function inside! Today&#821...

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Trading with Support Vector Machines (SVM)

November 30, 2012
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Trading with Support Vector Machines (SVM)

Finally all the stars have aligned and I can confidently devote some time for back-testing of new trading systems, and Support Vector Machines (SVM) are the new “toy” which is going to keep me busy for a while. SVMs are a well-known tool from the area of supervised Machine Learning, and they are used both

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