September 2015

Creating a scale transformation

September 4, 2015 | Peter's stats stuff - R

A better transformation than my better transformation In an earlier post I put forward the idea of a modulus power transform - basically the square root (or other similar power transformation) of the absolute value of a variable like income, followed by restoring the sign to it. The idea is ... [Read more...]

RcppArmadillo 0.5.500.2.0

September 3, 2015 | Thinking inside the box

Once again time for the monthly upstream Armadillo update -- version 5.500.2 was released earlier today by Conrad. And a new and matching RcppArmadillo release 0.5.500.2.0 in already on CRAN and will go to Debian shortly. Armadillo is a powerful and expressive C++ template library for linear algebra aiming towards a good ... [Read more...]

ABC model choice via random forests [and no fire]

September 3, 2015 | xi'an

While my arXiv newspage today had a puzzling entry about modelling UFOs sightings in France, it also broadcast our revision of Reliable ABC model choice via random forests, version that we resubmitted today to Bioinformatics after a quite thorough upgrade, the most dramatic one being the realisation we could also ... [Read more...]

On NCDF Climate Datasets

September 3, 2015 | arthur charpentier

Mid november, a nice workshop on big data and environment will be organized, in Argentina, We will talk a lot about climate models, and I wanted to play a little bit with those data, stored on http://dods.ipsl.jussieu.fr/mc2ipsl/. Since Ewen (aka @3wen) has been working ...
[Read more...]

Free R Help

September 3, 2015 | Ari Lamstein

Today I am giving away 10 sessions of free, online, one-on-one R help. My hope is to get a better understanding of how my readers use R, and the issues they face when working on their own projects. The sessions will be over the next two weeks, online and 30-60 minutes ...
[Read more...]

Dissolve polygons in R

September 3, 2015 | philmikejones

Dissolving polygons is another fairly elementary GIS task that I need to perform regularly. With R this is can be a bit involved, but once done is fully reproducible and the code can be re-used. This post is essentially a companion piece to Clipping polygons in R; I wrote both ... [Read more...]

Logistic Regression in R – Part Two

September 2, 2015 | atmathew

My previous post covered the basics of logistic regression. We must now examine the model to understand how well it fits the data and generalizes to other observations. The evaluation process involves the assessment of three distinct areas – goodness of fit, tests of individual predictors, and validation of predicted values – ... [Read more...]

reaching transcendence for Gaussian mixtures

September 2, 2015 | xi'an

“…likelihood inference is in a fundamental way more complicated than the classical method of moments.” Carlos Amendola, Mathias Drton, and Bernd Sturmfels arXived a paper this Friday on “maximum likelihood estimates for Gaussian mixtures are transcendental”. By which they mean that trying to solve the five likelihood equations for a ...
[Read more...]

Connecting R to MySQL/MariaDB

September 2, 2015 | Jason French

Overview Relational databases, such as MySQL, organize data into tables consisting of rows and columns similarly to an R data.frame. While many beginners will be satisfied with R’s native RData storage format, storing data in a flat-file has its disadvantages. First, they are difficult to share among collaborators. .... [Read more...]

Predicting creditability using logistic regression in R (part 1)

September 2, 2015 | Mic

As I said in the previous post, this summer I’ve been learning some of the most popular machine learning algorithms and trying to apply what I’ve learned to real world scenarios. The German Credit dataset provided by the UCI Machine Learning Repository is another great example of application.... [Read more...]

Mathematical annotations on R plots

September 2, 2015 | R on Rob J Hyndman

I’ve always struggled with using plotmath via the expression function in R for adding mathematical notation to axes or legends. For some reason, the most obvious way to write something never seems to work for me and I end up using trial and error in a loop with far ...
[Read more...]

Mathematical annotations on R plots

September 2, 2015 | Rob J Hyndman

I’ve always struggled with using plotmath via the expression function in R for adding mathematical notation to axes or legends. For some reason, the most obvious way to write something never seems to work for me and I end up using trial and error in a loop with far ... [Read more...]

Unit Converter

September 1, 2015 | Stephen Master

Introduction Dan continues to crank out book chapter-length posts, which probably means that I should jump in before getting further behind…so here we go. In the next few posts, I’d like to cover some work to help you to process aggregated proficiency testing (PT) data. Interpreting PT data ... [Read more...]
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