March 2014

Evolution of Code

March 27, 2014 | Educate-R - R

Recently while scraping some data from the college football data warehouse site, I started to realize the evolution of my code. To preface this, I am definitely not a trained programmer, just a self taught junky who enjoys doing it when I have time. ... [Read more...]

Seasonal Unit Roots

March 26, 2014 | arthur charpentier

As discussed in the MAT8181 course, there are – at least – two kinds of non-stationary time series: those with a trend, and those with a unit-root (they will be called integrated). Unit root tests cannot be used to assess whether a time series is stationary, or not. They can only detect ... [Read more...]

Give your R charts that Wes Anderson style

March 26, 2014 | David Smith

I'm a big fan of Wes Anderson's movies. I love the quirky characters and stories, the distinctive cinematography, and the unique visual style. Now you can bring some of that style to your own R charts, by making use of these Wes Anderson inspired palettes. Just choose your favourite Wes ... [Read more...]

MCMC for Econometrics Students – IV

March 26, 2014 | Dave Giles

This is the fourth in a sequence of posts designed to introduce econometrics students to the use of Markov Chain Monte Carlo (MCMC, or MC2) simulation methods for Bayesian inference. The first three posts can be found here, here, and here, and I'll assume that you've read them already. The ... [Read more...]

MCMC for Econometrics Students – Part IV

March 26, 2014 | Dave Giles

This is the fourth in a sequence of posts designed to introduce econometrics students to the use of Markov Chain Monte Carlo (MCMC, or MC2) simulation methods for Bayesian inference. The first three posts can be found here, here, and here, and I'll assume that you've read them already. The ... [Read more...]

CpG Island shelves

March 26, 2014 | Kalyan Kumar Pasumarthy

Nowadays, regions with relatively lower CpG density are gaining importance in DNA methylation studies. This is based on the fact that a majority of CpG rich regions (CpG islands) are non-dynamic and less variant in terms of methylation status probed ac... [Read more...]

How to open an SPSS file into R

March 26, 2014 | Davide Massidda

R is a powerful system for statistical analysis and data visualization. However, it’s not exactly user-friendly for data storage, so, still for several time your data will be archived using Excel, SPSS or similar programs. How to open into R … Continue reading → [Read more...]

Accessing iNaturalist data

March 26, 2014 | rOpenSci Blog - R

The iNaturalist project is a really cool way to both engage people in citizen science and collect species occurrence data. The premise is pretty simple, users download an app for their smartphone, and then can easily geo reference any specimen they see, uploading it to the iNaturalist website. It let's ... [Read more...]

RProtoBuf 0.4.1

March 25, 2014 | Thinking inside the box

A new bug-fix release release 0.4.1 of RProtoBuf, is now on CRAN. RProtoBuf provides GNU R bindings for the Google Protocol Buffers ("Protobuf") data encoding library used and released by Google, and deployed as a language and operating-system agno... [Read more...]

R 101: Summarizing Data

March 25, 2014 | atmathew

When working with large amounts of data that is structured in a tabular format, a common operation is to summarize that data in different ways using specific variables. In Microsoft Excel, pivot tables are a nice feature that is used for this purpose. While not as “efficient” in relation to ... [Read more...]

A Thumbnail History of Ensemble Methods

March 25, 2014 | Joseph Rickert

By Mike Bowles Ensemble methods are the backbone of machine learning techniques. However, it can be a daunting subject for someone approaching it for the first time, so we asked Mike Bowles, machine learning expert and serial entrepreneur to provide some context. Ensemble Methods are among the most powerful and ... [Read more...]

Filtering Data with L2 Regularisation

March 25, 2014 | andrew

I have just finished reading Momentum Strategies with L1 Filter by Tung-Lam Dao. The smoothing results presented in this paper are interesting and I thought it would be cool to implement the L1 and L2 filtering schemes in R. We’ll start with the L2 scheme here because it has ... [Read more...]

Wright Map Tutorial – Part 3

March 25, 2014 | R Snippets for IRT

In this part of the tutorial, we’ll show how to load ConQuest output to make a CQmodel object and then WrightMaps. We’ll also show how to turn deltas into thresholds. All the example files here are available in the /inst/extdata folder of the github. If you download ...
[Read more...]

Sankey diagrams with googleVis

March 25, 2014 | Markus Gesmann

Sankey diagrams are great for visualising flows from one set of data values to another. Although named after Irish Captain Matthew Henry Phineas Riall Sankey, who used this type of diagram in 1898 to show the energy efficiency of a steam engine, the best know Sankey diagram is probably Charles Minard's ...
[Read more...]
1 2 3 4 5 15

Never miss an update!
Subscribe to R-bloggers to receive
e-mails with the latest R posts.
(You will not see this message again.)

Click here to close (This popup will not appear again)