February 2013

Whats new in rugarch (ver 1.01-5)

February 27, 2013 | alexios

Since the last release of rugarch on CRAN (ver 1.0-16), there have been many changes and new features in the development version of the package (ver 1.01-5). First, development of the package (and svn) has been moved to google code from r-forge. Second, the package now features exclusive use of ... [Read more...]

Fast factor generation with Rcpp

February 27, 2013 | Rcpp Gallery

Recall that factors are really just integer vectors with ‘levels’, i.e., character labels that get mapped to each integer in the vector. How can we take an arbitrary character, integer, numeric, or logical vector and coerce it to a factor with Rcpp? It’s actually quite easy with Rcpp ...
[Read more...]

How to make a scientific result disappear

February 27, 2013 | Justin Esarey

Nathan Danneman (a co-author and one of my graduate students from Emory) recently sent me a New Yorker article from 2010 about the “decline effect,” the tendency for initially promising scientific results to get smaller upon replication. Wikipedia can summarize the phenomenon as well as I can: In his article, Lehrer ... [Read more...]

Facebook Hacker Cup – Beautiful Strings

February 26, 2013 | Frank Portman

Now that the Facebook Hacker Cup is coming to an end I figured I’d post my solution to one of the challenges. Unfortunately I only made it to Round 1, but I was able to answer this rather interesting Qualification Round problem. The Problem: When John was a little kid ... [Read more...]

New R Workshop in the Bay Area

February 26, 2013 | Rob Kabacoff

Practical Data Visualization with R Saturday March 9th, 2013 8:30-5:00pm EBay 2161 North 1st Street San Jose, California I will be presenting a one day professional development workshop on modern data visualization with R, sponsored by the ACM San Francisco Bay … Continue reading → [Read more...]

New ways to Hadoop with R

February 26, 2013 | David Smith

Today, there are two main ways to use Hadoop with R and big data: 1. Use the open-source rmr package to write map-reduce tasks in R (running within the Hadoop cluster - great for data distillation!) 2. Import data from Hadoop to a server running Revolution R Enterprise, via Hbase, ODBC (for ... [Read more...]

Job for life ? Bishop of Rome ?

February 26, 2013 | arthur charpentier

The job of Bishop of Rome – i.e. the Pope – is considered to be a life-long commitment. I mean, it usually was. There have been 266 popes since 32 A.D. (according to http://oce.catholic.com/…): almost all popes have served until their death. But that does not mean that they ... [Read more...]

Automatic Notice When Vacancy Available

February 26, 2013 | Huidong Tian

Today, I visited a webpage inadvertently and found several job positions that I am competent with, unfortunately all of them has expired. How many chances we lost in this way?! So I decide to do somthing to limit this kind of loss, and of course using our smart R! The ... [Read more...]

The stringdist package

February 26, 2013 | mark

String metrics have important applications in web search, spelling correction and computational biology amongst others. Many different metrics exist, but the most well-known are based on counting the number of basic edit operations it takes to turn one string into … Continue reading → [Read more...]

First steps of using googleVis on shiny

February 26, 2013 | Markus Gesmann

The guys at RStudio have done a fantastic job with shiny. It is really easy to build web apps with R using shiny. With the help of Joe Cheng from RStudio we figured out a way to make googleVis work on shiny as well. This allows you to make use ... [Read more...]

Normal distribution functions

February 25, 2013 | Slawa Rokicki

Ah, the Central Limit Theorem.  The basis of much of statistical inference and how we get those 95% confidence intervals.  It's just so beautiful!  Lately, I have found myself looking up the normal distribution functions in R.  They... [Read more...]

What is Revolution R Enterprise?

February 25, 2013 | David Smith

Let us explain, in 90 seconds: Want a more in-depth introduction to R and Revolution R Enterprise? I'll be giving the webinar Revolution R Enterprise: 100% R and More on March 14. Just follow the link below to secure your seat for the live presentation, and to receive notification of the replay. Revolution ... [Read more...]

R/ggplot2 tip: aes_string

February 25, 2013 | nsaunders

I’m a big fan of ggplot2. Recently, I ran into a situation which called for a useful feature that I had not used previously: aes_string. Imagine that you have data consisting of observations for several variables – let’s say A, B, C – where each observation is from one ... [Read more...]

The Fun of Error Trapping: R Package Edition

February 25, 2013 | Randy Zwitch

For the last month or so I’ve been working on an R package to make accessing the Adobe (Omniture) Digital Marketing Suite Reporting API easier.  As part of this development effort, I’m at the point where I’m intentionally introducing errors into my function inputs, trying to guess ... [Read more...]

Exporting nice plots in R

February 25, 2013 | Max Gordon

[caption id="attachment_548" align="aligncenter" width="500"] It's not always easy getting the right size. The image is CC by Kristina Gill.[/caption] A vital part of statistics is producing nice plots, an area where R is outstanding. The graphical ablility of R is often listed as a major reason for ... [Read more...]

Simplify frequency plots with ggplot in R #rstats

February 25, 2013 | Daniel

Update March 5th All downloads are now accessible from my script page! Summary This posting shows how to plot frequency plots using the ggplot-package in R. Compared to SPSS standard outputs, you will learn how to create appealing diagrams ready … Weiterlesen → [Read more...]
1 2 3 4 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)