937 search results for "parallel"

Mahout for R Users

June 9, 2013
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Mahout for R Users

I have a few posts coming up on Apache Mahout so I thought it might be useful to share some notes. I came at it as primarily an R coder with some very rusty Java and C++ somewhere in the back of my head so that will be my point of reference. I’ve also included … Continue reading...

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Feature Selection 3 – Swarm Mentality

June 6, 2013
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Feature Selection 3 – Swarm Mentality

"Bees don't swarm in a mango grove for nothing. Where can you see a wisp of smoke without a fire?" - Hla Stavhana In the last two posts, genetic algorithms were used as feature wrappers to search for more effective subsets of predictors. Here, I will do the same with another type of search algorithm: particle swarm optimization....

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Veterinary Epidemiologic Research: Modelling Survival Data – Semi-Parametric Analyses

June 4, 2013
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Veterinary Epidemiologic Research: Modelling Survival Data – Semi-Parametric Analyses

Next on modelling survival data from Veterinary Epidemiologic Research: semi-parametric analyses. With non-parametric analyses, we could only evaluate the effect one or a small number of variables. To evaluate multiple explanatory variables, we analyze data with a proportional hazards model, the Cox regression. The functional form of the baseline hazard is not specified, which make

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Snowfall

May 31, 2013
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Snowfall

Yesterday I had a short post reminding EViews users that their package (versions 7 or 8) will access all of the cores on a multi-core machine. I've been playing around with parallel processing in R on my desktop machine at work over the last few days. It's something I've been meaning to do...

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Regression regularization example

May 31, 2013
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Regression regularization example

Recently I needed a simple example showing when application of regularization in regression is worthwhile. Here is the code I came up with (along with basic application of parallelization of code execution). Assume you have 60 observations and 50 expla...

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Stepping up to Big Data with R and Python: A Mind Map of All the Packages You Will Ever Need

May 29, 2013
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Stepping up to Big Data with R and Python: A Mind Map of All the Packages You Will Ever Need

On May 8, we kicked off the transformation of R Users DC to Statistical Programming DC   (SPDC) with a meetup at iStrategyLabs in Dupont Circle. The meetup, titled “Stepping up to big data with R and Python,” was an … Continue reading →The post Stepping up to Big Data with R and Python: A Mind Map...

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Exploratory Data Analysis: Variations of Box Plots in R for Ozone Concentrations in New York City and Ozonopolis

Exploratory Data Analysis: Variations of Box Plots in R for Ozone Concentrations in New York City and Ozonopolis

Introduction Last week, I wrote the first post in a series on exploratory data analysis (EDA).  I began by calculating summary statistics on a univariate data set of ozone concentration in New York City in the built-in data set “airquality” in R.  In particular, I talked about how to calculate those statistics when the data

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Compiling R from Source with OpenMP, Accelerate and MKL in OS X

May 24, 2013
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Compiling R from Source in OS X I set out to find out whether I could speed up R by compiling it from source and: using Apple´s Accelerate Framework enabling OpenMP (which is disabled under OS X and Windows by default, but enabled under Linux) using Intel´s Intel´s Math Kernel Library I also wanted to know how an implicit parallel library,...

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7th R/Rmetrics workshop in Switzerland, June 30-July 4

May 23, 2013
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The 7th annual R/Rmetrics Workshop om Computational Finance and Financial Engineering will take place June 30-July 4 in the beatiful alpine setting of Lake Thune, Switzerland. This is an intimate workshop limited to around 50 participants, and features tutorials from leading practitioners in finance with R, with a special focus on the Rmetrics suite of R packages. This year's...

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Big Data Analytics in R – the tORCH has been lit!

May 22, 2013
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