RStudio v0.95 Preview Available

January 10, 2012
By
RStudio v0.95 Preview Available

The next version of RStudio (v0.95) is now available as a preview release. Highlights include: Projects — A new system for managing R projects that enables easy switching between working directories, running multiple instances of RStudio with different projects, and per-project contexts for source documents, workspaces, and history. Code Navigation — Typeahead navigation by file

Read more »

Time Series Cointegration in R

January 10, 2012
By

Cointegration can be a valuable tool in determining the mean reverting properties of 2 time series. A full description of cointegration can be found on Wikipedia. Essentially, it seeks to find stationary linear combinations of the two vectors. The below R code, which has been modified from here, will test two series for integration and return the...

Read more »

How big is my dog going to get? A regression analysis with R

January 10, 2012
By
How big is my dog going to get? A regression analysis with R

The dog on the left is named Maya. She is a labrador retriever (field line), weighs 18 kilograms and is currently eight months old. My girlfriend and I carry the dog several times a day high in the fourth floor. … Weiterlesen →

Read more »

Introduction to Kaggle Algorithmic Trading Challenge

January 10, 2012
By

I recently participated in the Kaggle Algorithmic Trading Competition under the username VikP. For those who do not know what Kaggle is, it is a web site where individuals and corporations can host data analysis competitions. This particular competiti...

Read more »

Using R in Ruby

January 10, 2012
By

Integrating R into more traditional programming languages can be incredibly rewarding due to R's powerful built-in statistical tools, but it can also be extremely frustrating at times. Thankfully, like much else to do with Ruby, integrating R and Ruby...

Read more »

Revolution Analytics 2012 R User Group Sponsorship Program

January 10, 2012
By

On of Revolution Analytics' main missions is to support and foster the growth of the R community, and in 2011 we sponsored more than 25 local R user groups and meetings with cash donations for for venue hire, meetup.com dues, refreshments, and other group needs. We also sent hundreds of "I love R" T-shirts and stickers to group members...

Read more »

Suicide vs Divorce rates by country using ggplot

January 10, 2012
By
Suicide vs Divorce rates by country using ggplot

I was looking for data I could use with the geom_text() object in ggplot2 and came across this data from the World Health Organization about the suicide rates by country which I found very handy for my example. I used the scale_colour_gradient2() with 3 colors, red, gray and black but it only picked up gray and

Read more »

Coming of Age: R and Spatial Data Visualisation

January 10, 2012
By
Coming of Age: R and Spatial Data Visualisation

I have been using R (a free statistics and graphics sof

Read more »

Presenting results of logistic regression

January 10, 2012
By
Presenting results of logistic regression

So my advisor pointed out this 'new' (well, 2004), way of plotting results of logistic regression results. The idea was presented in a 2004 Bulletin of the Ecological Society of America issue (here). I tried to come up with a solution using, what el...

Read more »

Presenting results of logistic regression

January 10, 2012
By
Presenting results of logistic regression

So my advisor pointed out this 'new' (well, 2004), way of plotting results of logistic regression results. The idea was presented in a 2004 Bulletin of the Ecological Society of America issue (here). I tried to come up with a solution using, what el...

Read more »

Words in Politics: Some extensions of the word cloud

January 10, 2012
By
Words in Politics: Some extensions of the word cloud

The word cloud is a commonly used plot to visualize a speech or set of documents in a succinct way. I really like them. They can be extremely visually pleasing, and you can spend a lot of time perusing over the words gaining new insights. That said, they don't convey a great deal of information. From a

Read more »

Aggregation and Restructuring data (from “R in Action”)

January 9, 2012
By
Aggregation and Restructuring data (from “R in Action”)

The followings introductory post is intended for new users of R.  It deals with the restructuring of data: what it is and how to perform it using base R functions and the {reshape} 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 Read more...

Read more »

Honing Your R Skills for Job Interviews

January 9, 2012
By
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...

Read more »

Harmonic means, again again

January 9, 2012
By
Harmonic means, again again

Another arXiv posting I had had no time to comment is Nial Friel’s and Jason Wyse’s “Estimating the model evidence: a review“. This is a review in the spirit of two of our papers, “Importance sampling methods for Bayesian discrimination between embedded models” with Jean-Michel Marin (published in Jim Berger Feitschrift, Frontiers of Statistical Decision

Read more »

R in Axys (Impossible Dream)

January 9, 2012
By
R in Axys (Impossible Dream)

It has always been a dream of mine to incorporate R graphs and analysis in an Advent Axys report.  The unbelievable work from the guys at Statconn http://rcom.univie.ac.at/ make this dream possible.  If we use the same perhstsp.rep created fo...

Read more »

Optimization for Finance with R

January 9, 2012
By

Last year, the Statistics and Mathematics Department of the Vienna University School of Economics and Business presented a research seminar series on optimization, taught by R Core Group member Kurt Hornik (with Ronald Hochreiter and Stefan Theussl). Even if you couldn't make it to Austria to attend the course, the course materials are available online, and make an excellent...

Read more »

Creating LaTeX Tables from Zelig and Statnet objects

January 9, 2012
By

As a PhD student that uses quantitative methods a lot, one annoying part of my job is to type up my results, especially formatting tables with regression models can be a lot of work. Luckily there is an excellent package in R, apsrtable, which will gen...

Read more »

Goals for 2012

January 9, 2012
By

I have never been one to set New Year’s resolutions. Personally, they instill a dangerous personal freedom that often yield naive, subconscious mentalities, such as I can do anything I want until December 31, and I will change abruptly the next day. ...

Read more »

Sensitivity of risk parity to variance differences

January 9, 2012
By
Sensitivity of risk parity to variance differences

Equal risk contribution of assets determines the asset weights given the variance matrix.  How sensitive are those weights to the variance estimate? Previously The post “Risk parity” gave an overview of the idea. In particular it distinguished the cases: the assets have equal risk contribution groups of assets have equal risk contribution A key difference … Continue reading...

Read more »

Feedback from vignette survey

January 8, 2012
By
Feedback from vignette survey

Many thanks to all who participated in the survey about writing R package vignettes.Following my post last Thursday the responses came in quickly in the evening and all day on Friday. Since Saturday the response rate has been decreasing constantly and ...

Read more »

Testing twitterfeed

January 8, 2012
By
Testing twitterfeed

Does this work on twitterfeed?

Read more »

Tracking my expenses

January 8, 2012
By
Tracking my expenses

One new-year resolution I made last year was to understand where my money goes. From previous experiments I know that expense tracking has to be as simple as possible. My approach is toUse my cash card as often as possible. This automatically tracks the date and some information on the vendor. Use twitter to track my cash expenses. This supplements...

Read more »

“Hold Only That Pair of 2s?” Studying a Video Poker Hand with R

January 8, 2012
By
“Hold Only That Pair of 2s?” Studying a Video Poker Hand with R

Whenever I tell people in my family that I study Statistics, one of the first questions I get from laypeople is “do you count cards?” A blank look comes over their face when I say “no.” Look, if I am at a casino, I am well aware that the odds are against me, so why even try to think that...

Read more »

Lesson 2: Values & Variables (CloudStat School)

January 8, 2012
By

This is the second lesson of CloudStat School, Lesson 2: Values & Variables. At the end of the lesson 2, you should know: 1. Inserting values into valuables 2. Calling valuables 3. Simple operation within variables. 2.1 Assign/Insert Values into Vari...

Read more »

When I was 29…

January 8, 2012
By

Today was my 29th birthday, and I kept things simple: I ate with my wife and my newborn son at a local eatery. Later, my wife cooked steaks for dinner. For the most part, I took the day off in that I did not work on my dissertation. But I did spent muc...

Read more »

Project Euler in R: Problem 22

January 7, 2012
By

I solve Project Euler problems for recreation. I am using the Statistical Language R to solve these. R is free for use and download, so I would recommend downloading it if you are interested in Statistical computation. This is problem 22 from Project E...

Read more »

1500th, 3000th, &tc

January 7, 2012
By
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

Read more »

Analyzing R-bloggers

January 6, 2012
By
Analyzing R-bloggers

In the last two posts we saw how to download posts from R-bloggers, and then extract the title, author and date of each post and write that information to a csv file. Since we now have a nice data set from r-bloggers, we can start to examine the develo...

Read more »

R: Web Scraping R-bloggers Facebook Page

January 6, 2012
By
R: Web Scraping R-bloggers Facebook Page

  Introduction R-bloggers.com is a blog aggregator maintained by Tal Galili. It is a great website for both learning about R and keeping up-to-date with the latest developments (because someone will probably, and very kindly, post about the status of some R related feature). There is also an R-bloggers facebook page where a number of

Read more »