3863 search results for "GIS"

R to GeoJSON

June 30, 2013
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UPDATE As you can see in Patrick's comment below you can convert to GeoJSON format files with rgdal as an alternative to calling the Ogre web API described below. See here for example code for converting to GeoJSON with rgdal. GitHub recently introduced the ability to render GeoJSON files on their site as maps here, and recently...

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Fun with Fremont Bridge Bicyclists

June 27, 2013
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Fun with Fremont Bridge Bicyclists

Given the title of this post and its proximity to the Solstice, you will be disappointed to know that I am not writing about naked bicyclists. I apologize for any false hope I may have instilled in you.On October 11th, 2012, the city of Seattle, WA beg...

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Trading Strategy 1: What goes up, goes up…

June 26, 2013
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Trading Strategy 1: What goes up, goes up…

As I said earlier, my main task at my internship is to hunt for profitable strategies. As you can imagine, strategies can range from the exceedingly simple and easy to implement, to the crazily complex. Let’s start out with one … Continue reading →

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Technical(and not technical) strategy testing

June 25, 2013
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Technical(and not technical) strategy testing

I got "hooked" on OOP approach of R in particular reference classes. And after my last little project on option scenario analysis I reconstructed my messy technical strategy testing code.Now to begin I would like to reason why I have done this while there exists a nice "blotter" and "quantstrat" packages.First of all "quantstrat" is faster than blotter, which...

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rClr: low level access to .NET from R

June 25, 2013
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rClr: low level access to .NET from R

rClr is a package to access arbitrary .NET code seamlessly. The "CLR" acronym part of the package name stands for Common Language Runtime. C# and R being languages I regularly use, I have felt the need for better interoperability between these for a fe...

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Split violin plots

June 25, 2013
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Split violin plots

(This article was first published on Ecology in silico, and kindly contributed to R-bloggers) Violin plots are useful for comparing distributions. When data are grouped by a factor with two levels (e.g. males and females), you can split the violins in half to see the difference between groups. Consider a 2 x 2 factorial experiment: treatments A and B...

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Three Ways to Run Bayesian Models in R

June 25, 2013
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Three Ways to Run Bayesian Models in R

There are different ways of specifying and running Bayesian models from within R. Here I will compare three different methods, two that relies on an external program and one that only relies on R. I won’t go into much detail about the differences in syntax, the idea is more to give a gist about how the different modeling languages...

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Visualising Crime Hotspots in England and Wales using {ggmap}

June 24, 2013
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Visualising Crime Hotspots in England and Wales using {ggmap}

Two weeks ago, I was looking for ways to make pretty maps for my own research project. A quick search led me to some very informative blog posts by Kim Gilbert, David Smith and Max Marchi. Eventually, I Google'd the excellent crime weather map exa...

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My Stat Bytes talk, with slides and code

June 24, 2013
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On Thursday of last week I gave a short informal talk to Stat Bytes, the CMU Statistics department‘s twice a month computing seminar. Quick tricks for faster R code: Profiling to Parallelism Abstract: I will present a grab bag of … Continue reading →

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My Stat Bytes talk, with slides and code

June 24, 2013
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On Thursday of last week I gave a short informal talk to Stat Bytes, the CMU Statistics department's twice a month computing seminar. Quick tricks for faster R code: Profiling to Parallelism Abstract: I will present a grab bag of tricks to speed up your R code. Topics will include: installing an optimized BLAS, how

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