This is an introductory-level course in supervised learning, with a focus on regression and classification methods. The syllabus includes: linear and polynomial regression, logistic regression and linear discriminant analysis; cross-validation and the bootstrap, model selection and regularization methods (ridge and … Continue reading → [Read more...]

This week my research group discussed Adrian Raftery’s recent paper on “Use and Communication of Probabilistic Forecasts” which provides a fascinating but brief survey of some of his work on modelling and communicating uncertain futures. Coincidentally, today I was also sent a copy of David Spiegelhalter’s paper on “... [Read more...]

Have you tried synchronizing R processes? I did and it wasn’t straightforward. In fact, I ended up creating a new package – flock. One of the improvements I did not too long ago to my R back-testing infrastructure was to start using a database to store the results. This way ... [Read more...]

Today's exercise in another easy one, and is inspired by a question from Ariel Marcy of University of Queensland.Exercise 5 - How to extract classifiers from names of specimens.Well-organised morphometricians will have a consistent naming system for th... [Read more...]

Last week I attended a “Flower Festival” in Joinville, where I had opportunity to admire several of among the most beautiful and awarded flowers, orchids, and decoration plants. Surprisingly, though, I never had thought on flowers like fractals the way I did this time. Introduction Fractals attract lots of interest, ... [Read more...]

This is a guest post by Prasad Patil that answers the question: how to put a shape in the margin of an R plot? The help page for R's par() function is a somewhat impenetrable list of abbreviations that allow you to manipulate anything and everything in the plotting device. ... [Read more...]

Geomorph users,We have uploaded version 2.1.2 to CRAN. The windows and mac binaries have been compiled and the tarball is available.Version 2.1.2 comes with some small changes and new features: New functions advanced.procD.lm()for statis... [Read more...]

Last week I ran a one-day workshop on RNA-seq data analysis in the UVA Health Sciences Library. I set up an AWS public EC2 image with all the necessary software installed. Participants logged into AWS, launched the image, and we kicked off the morning ... [Read more...]

At this meetup we’re fortunate to have RStudio’s lead developer Joe Cheng flying in from... [Read more...]

by Joseph Rickert We usually have a pretty good time at the monthly Bay Area useR Group (BARUG) meetings, but this month's meeting was a bit more of a party than usual. The very well connected PR team at Sqor Sports, our host company for the evening, secured San Francisco's ... [Read more...]

Every campaign cycle I usually do similar things, go to a repository, download a bounce of data, merge and store them to an existing RData file for posterior analysis. I've already wrote about this topic some time ago, but this time I think my script became simpler. Set the Directory ... [Read more...]

20.11.2014 In my last post i presented the first version of a debugging GUI for R in Bio7 which is just a visual wrapper for the default R debugging functions. In the meantime i added some new methods and also improved the visualization. For the upcoming Bio7 release i have to ... [Read more...]

Why create a personal R package? As a consulting data scientist, I write a lot of R code in a lot of different places – physically and virtually. Different computers, servers, evironments, VPNs, operating systems, all of the above. Even when I have the luxury of working with the same client (... [Read more...]

Todd Schneider's blog post on solving the traveling salesman problem with R hit the front page of reddit.com. This is a big deal: front-page placement on the popular social news site can drive a ton of traffic (in Todd's case, 1.3 million pageviews). But what factors determine which of reddit's ... [Read more...]

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Several readers, upon seeing the risk and return ratio along with other statistics in the previous post stated that the … Continue reading → [Read more...]

Dear R users, Quantide is proud to announce its second […] [Read more...]

One nice thing about open-source software is that users often have a lot of choices.  Such is the case with R, for instance the thousands of contributed packages available on CRAN.  My focus here is on BLAS, the core of matrix operations in R, where again there are interesting choices ... [Read more...]

Any practicing data scientist is going to eventually have to work with a data stored in a Microsoft Excel spreadsheet. A lot of analysts use this format, so if you work with others you are going to run into it. We have already written how we Related posts: Please stop ... [Read more...]

Earlier today, Josh send the text below to the R-SIG-Finance list, and I updated the R/Finance website, including its Call for Papers page, accordingly. We are once again very excited about our conference, thrilled about the four confirmed keynotes, and hope that many R / Finance users will not only ... [Read more...]