785 search results for "parallel"

CBC Reviews: Revolution R (in which this doesn’t go well)

January 24, 2012
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CBC Reviews: Revolution R (in which this doesn’t go well)

Update!: The latest version of Revolution R, which added support for RHEL 6, appears to work (it appears to at least install, run, and perform basic tasks). See this post for more details. I’ve come to enjoy using R. I had dabbled with it in the past, but found it painfully opaque, and the Effort:Reward

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Interactive Graphics with the iplots Package (from “R in Action”)

January 24, 2012
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Interactive Graphics with the iplots Package (from “R in Action”)

(This article was first published on R-statistics blog » R, and kindly contributed to R-bloggers) The followings introductory post is intended for new users of R.  It deals with interactive visualization using R through the iplots package. This is a guest article by Dr. Robert I. Kabacoff, the founder of (one of) the first online R tutorials websites: Quick-R. Kabacoff has...

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R in the cloud

January 19, 2012
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Psychometrics, Qu’est-ce que c’est? Say psychometrics to people and they think IQ tests. Fair enough. I think eRm: 1 2 3 4 5 6 7 # Rasch model with beta.1 restricted to 0 data(raschdat1) res <- RM(raschdat1, sum0 = FALSE) print(res) summary(res) res$W The joy of fitting your first Rasch model in R is unparallelled. Go on try, it. Hmmm, a list of numbers. No idea what they mean? ok. so you take an IQ...

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Improve Predictive Performance in R with Bagging

January 18, 2012
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Bagging, aka bootstrap aggregation, is a relatively simple way to increase the power of a predictive statistical model by taking multiple random samples(with replacement) from your training data set, and using each of these samples to construct a separate model and separate predictions for your test set. These predictions are then averaged to create a, hopefully more accurate,...

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Improve Predictive Performance in R with Bagging

January 18, 2012
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Bagging, aka bootstrap aggregation, is a relatively simple way to increase the power of a predictive statistical model by taking multiple random samples(with replacement) from your training data set, and using each of these samples to construct a separate model and separate predictions for your test set. These predictions are then averaged to create a, hopefully more accurate, final...

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Sorting in R as Inefficiently as Possible

January 12, 2012
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Sorting in R as Inefficiently as Possible

My last post of substance was all about improving your performance using R to answer programming questions that might be asked during a job interview.  So let's say you nailed the interview and got the job, but you desperately want to be fired for grand incompetence.  Never fear, your pal at librestats once again has your back. The sleep...

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Honing Your R Skills for Job Interviews

January 9, 2012
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Honing Your R Skills for Job Interviews

My time as a grad student will soon draw to a close. With this comes the terrifying realisation that I'm going to start applying for jobs and, hopefully, interviewing soon, forever leaving my comfortable security blanket of academia. With that horrible thought in mind, I've been doing some poking around to see what various kinds of technical interviews are...

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1500th, 3000th, &tc

January 7, 2012
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1500th, 3000th, &tc

As the ‘Og reached its 1500th post and 3000th comment at exactly the same time, a wee and only mildly interesting Sunday morning foray in what was posted so far and attracted the most attention (using the statistics provided by wordpress). The most visited posts: Title Views Home page 203,727 In{s}a(ne)!! 7,422 “simply start over

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2012, Turing year

January 3, 2012
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2012, Turing year

Buying the special issue of La Recherche on “La révolution des mathématiques”, I discovered that this is the Alan Turing Year in celebration of the 100th anniversary of Turing‘s birth. The math department at the University of Leeds has a webpage on all the events connected with this celebration. From all over the World. (There

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BIG Data

December 31, 2011
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"Big Data" = data that come in amounts that are too large for current computer hardware and software to deal with. That sounds like fun!Norman Nie developed the well known SPSS statistical package in the 1960, and is currently President and CEO of Revolution Analytics, a California company that promotes the use of the R computing...

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