PELTing a Competing Changepoint Algorithm

February 9, 2015
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PELTing a Competing Changepoint Algorithm

This post will demonstrate the PELT algorithm from the changepoint package–a competing algorithm to the twitter package’s breakout detection algorithm. … Continue reading →

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MissData 2015 in Rennes [June 18-19]

February 9, 2015
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MissData 2015 in Rennes [June 18-19]

This (early) summer, a conference on missing data will be organised in Rennes, Brittany, with the support of the French Statistical Society . (Check the website if interested, Rennes is a mere two hours from Paris by fast train.)Filed under: R, ...

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CFP: 13th Australasian Data Mining Conference (AusDM 2015)

February 9, 2015
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CFP: 13th Australasian Data Mining Conference (AusDM 2015)

The 13th Australasian Data Mining Conference (AusDM 2015) Sydney, Australia, 8-9 August 2015 co-located with SIGKDD’15 URL: http://ausdm15.ausdm.org/ Join us on LinkedIn: http://www.linkedin.com/groups/AusDM-4907891 The Australasian Data Mining Conference has established itself as the premier Australasian meeting for both practitioners and … Continue reading →

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Morse Code Converter

February 8, 2015
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Morse Code Converter

A few months ago, I finally got a chance to see The Imitation Game (the new Alan Turing movie), which gave me an idea for a Sunday morning R hacking session. The movie features a bunch of scenes with bustling rooms full or workers intercepting (and documenting) encrypted radio transmissions, which are then passed along...

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Pan-sharpening Using R

February 8, 2015
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Pan-sharpening Using R

In my previous post I described how to perform pan-sharpening using OrfeoToolbox and QGIS. This time I will show you how to do this in R. At the bottom you will find several functions I wrote on top of the 'raster' package that allow a convenient pan-sharpening in R.MotivationYou may wonder why I even...

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Chapter 3 of Modeling data with functional programming in R is out

February 8, 2015
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Chapter 3 of Modeling data with functional programming in R is out

Chapter 3 of my book “Modeling data with functional programming in R” is available for download. This chapter describes map-vectorization …Continue reading →

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UIUC free online courses on data mining starting on 9 Feb, lectured by Prof. Jiawei Han et al.

February 8, 2015
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UIUC free online courses on data mining starting on 9 Feb, lectured by Prof. Jiawei Han et al.

by Yanchang Zhao, RDataMining.com A series of free online data mining courses will start on 9 Feb 2015, lectured by Prof. Jiawei Han and several other staff at UIUC. Prof. Han is one of the top data mining researchers around … Continue reading →

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Hierarchical log odds model example

February 8, 2015
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Hierarchical log odds model example

I am working through Bayesian Approaches to Clinical Trials and Health-Care Evaluation (David J. Spiegelhalter, Keith R. Abrams, Jonathan P. Myles) (referred to as BACTHCE from here on). In chapter three I saw an example (3.13) where I wanted to d...

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Contingency Tables with gmodels in R

February 7, 2015
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Contingency Tables with gmodels in R

Contingency tables provide a way to display the frequencies and relative frequencies of observations, which are classified according to two categorical variables. The elements of one category are displayed across the columns; the

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rfoaas 0.1.3

February 7, 2015
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A brand new version of rfoaas is now on CRAN. It shadows the 0.1.3 release of FOAAS just how an earlier 0.1.2 had done (but there was something not quite right at the server backend which we coded around with an interim release 0.1.2.1; neither one of these was ever released to CRAN). The rfoaas package provides...

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drat Tutorial: First Steps towards Lightweight R Repositories

February 7, 2015
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Now that drat is on CRAN and I got a bit of feedback (or typo corrections) in three issue tickets, I thought I could show how to quickly post such an interim version in a drat repository. Now, I obviously already have a checkout of drat. If you, dear reader, wanted to play along and create your...

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More 3D Graphics (rgl) for Classification with Local Logistic Regression and Kernel Density Estimates (from The Elements of Statistical Learning)

February 7, 2015
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More 3D Graphics (rgl) for Classification with Local Logistic Regression and Kernel Density Estimates (from The Elements of Statistical Learning)

This post builds on a previous post, but can be read and understood independently. As part of my course on statistical learning, we created 3D graphics to foster a more intuitive understanding of the various methods that are used to relax the assumption of linearity (in the predictors) in regression and classification methods. The authors

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On making a Bayesian omelet

February 7, 2015
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My colleagues Eric-Jan Wagenmakers and Jeff Rouder and I have a new manuscript in which we respond to Hoijtink, van Kooten, and Hulsker's in press manuscript Why Bayesian Psychologists Should Change the Way they Use the Bayes Factor. They suggest a method for "calibrating" Bayes factor using error rates. We show that this method is fatally flawed, but also...

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Finding the dramatic arc of novels with sentiment analysis

February 6, 2015
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Finding the dramatic arc of novels with sentiment analysis

Sentiment analysis has been widely used to infer the mood of customers in emails, tweets and other short communications. The base assumption is that the sentiment is a fixed value: the email is either angry or happy; positive or negative. But in longer writings like a novel, we naturally expect the sentiment to vary over time. Can we apply...

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Re: Sorry for the mix up regarding Data Science candidates

February 6, 2015
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This was originally posted on the author’s LinkedIn You will find lots of advice on...

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Inequalities and Quantile Regression

February 6, 2015
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Inequalities and Quantile Regression

In the course on inequality measure, we've seen how to compute various (standard) inequality indices, based on some sample of incomes (that can be binned, in various categories). On Thursday, we discussed the fact that incomes can be related to different variables (e.g. experience), and that comparing income inequalities between coutries can be biased, if they have very different...

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A Machine Learning Result

February 5, 2015
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A Machine Learning Result

by Joseph Rickert Learning to effectively use any of the dozens of popular machine learning algorithms requires mastering many details and dealing with all kinds of practical issues. With all of this to consider, it might not be apparent to a person coming to machine learning from a background other than computer science or applied math that there are...

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Introducing drat: Lightweight R Repositories

February 5, 2015
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A new package of mine just got to CRAN in its very first version 0.0.1: drat. Its name stands for drat R Archive Template, and an introduction is provided at the drat page, the GitHub repository, and below. drat builds on a core strength of R: the ability to query multiple repositories. Just how one...

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Free online data mining and machine learning courses by Stanford University

February 5, 2015
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Free online data mining and machine learning courses by Stanford University

by Yanchang Zhao, RDataMining.com Three free online data mining and machine learning courses lectured by professors at Stanford University started in past two weeks, which provide excellent opportunities to learn advanced data mining and machine learning techniques. If you are … Continue reading →

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sjPlot package and related online manuals updated #rstats # ggplot

February 5, 2015
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sjPlot package and related online manuals updated #rstats # ggplot

My sjPlot package for data visualization has just been updated on CRAN. I’ve added some features to existing function, which I want to introduce here. Plotting linear models So far, plotting model assumptions of linear models or plotting slopes for each estimate of linear models were spread over several functions. Now, these plot types have

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A Step to the Right in R Assignments

February 4, 2015
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I received an out-of-band question on the use of %<>% in my CDC FluView post, and took the opportunity to address it in a broader, public fashion. Anyone using R knows that the two most common methods of assignment are the venerable (and sensible) left arrow <- and it’s lesser cousin =. <- has an

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Quickcheck: Randomized unit testing for R

February 4, 2015
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Hadley Wickham's testthat package has been a boon for R package authors, making it easy to write tests to verify that your code is working directly, and alerting you when you make changes to your code that inadvertently breaks things. For the RHadoop project, though, developer Antonio Piccolboni needed a different testing framework, that included the possibility of writing...

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Many package updates on CRAN

February 4, 2015
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Many package updates on CRAN

Over the last week or two I’ve been pushing all my packages to CRAN. pathological (for working with file paths), runittotestthat (for converting RUnit tests to testthat tests), and rebus (formerly regex, for building regular expressions in a human readable way) all make their CRAN debuts. assertive, for run-time testing your code has more checks

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The R Journal, Volume 6/2, December 2014 – is now online!

February 4, 2015
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The new issue of The R Journal is now available! You may Download the complete issue, or choose your pleasure from the following links: Table of contents Editorial Deepayan Sarkar Contributed Research Articles Coordinate-Based Meta-Analysis of fMRI Studies with R Andrea Stocco Automatic Conversion of Tables to LongForm Dataframes Jimmy Oh Prinsimp Jonathan Zhang, Nancy Heckman, Davor Cubranic, Joel G. Kingsolver, Travis...

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Predicting the six nations

February 4, 2015
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Predicting the six nations

By Douglas Ashton – Consultant, UK I don’t know a lot about rugby, which can be a problem living in a rugby town. Especially when the office sweep stake on the upcoming Wales vs England six nations game goes round: … Continue reading →

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Rmetrics Summer Workshop 2015

February 4, 2015
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(This article was first published on Rmetrics blogs, and kindly contributed to R-bloggers) To leave a comment for the author, please follow the link and comment on his blog: Rmetrics blogs. R-bloggers.com offers daily e-mail updates about R news and tutorials on topics such as: visualization (ggplot2, Boxplots, maps, animation), programming (RStudio, Sweave, LaTeX, SQL, Eclipse, git, hadoop, Web...

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Photos of the 6th MilanoR meeting

February 4, 2015
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Photos of the 6th MilanoR meeting

Photos of the 6th MilanoR meeting (Milano; December 18, 2014)

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Visualizing Home Ownership With Small Multiples And R

February 4, 2015
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Visualizing Home Ownership With Small Multiples And R

If everybody had an ocean, across the U.S.A., then everybody’d be surfin’ like California (Beach Boys, Surfin’ U.S.A.) I was invited to write a post for Domino Data Lab, a company based in California which provides a cloud-based machine learning platform which enables companies to use the power of the cloud to build analytical projects. I also … Continue reading...

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Financial Charts | Pan and Zoom

February 3, 2015
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The htmlwidget for Week 2 over at Building Widgets claims to add pan and zoom interactivity to almost all R charts.  Since their were no tests on financial charts, I thought I would try it out on a couple.  It really does work.  Here is an example ...

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