Creating Posters using R, Latex, Beamer and Beamerposter

September 18, 2012
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Creating Posters using R, Latex, Beamer and Beamerposter

A while ago I had the need to produce some posters that included lots of data (scientific style).  Having recently got back into R and learning LaTex I googled for a way to do this using R.  Here's what I found and ended up with, using R, LaT...

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Copulas and tail dependence, part 3

September 18, 2012
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Copulas and tail dependence, part 3

We have seen extreme value copulas in the section where we did consider general families of copulas. In the bivariate case, an extreme value can be writtenwhere is Pickands dependence function, which is a convex function satisfyingObserve that in ...

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Copulas and tail dependence, part 2

September 18, 2012
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Copulas and tail dependence, part 2

An alternative to describe tail dependence can be found in the Ledford & Tawn (1996) for instance. The intuition behind can be found in Fischer & Klein (2007)). Assume that and have the same distribution. Now, if we assume that those vari...

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Designing Data Apps with R at Periscopic

September 18, 2012
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Designing Data Apps with R at Periscopic

Today's guest post comes to us from Andrew Winterman, Data Designer at data visualization company Persiscopic. He shares with us the process of using the R language and other tools to create an interactive data application for a client — ed. The Hewlett Foundation contacted us a few months ago because they were interested in exploring ways to visualize...

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R Graphics with ggplot2

September 18, 2012
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R Graphics with ggplot2

ggplot2 is one of the most elegant R package for data analysis and visualization.  Recently I gave a tutorial on ggplot2 package.  You could find my ggplot2 notes here(click the image below). You could find my presentation slide below. The … Continue reading →The post R Graphics with ggplot2 appeared first on Fiddling with data and...

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Side note…

September 18, 2012
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MathJax allows you to customize how \( \LaTeX \) is displayed. Simply right click over the math you’d like to see to access the display menu. Under “math settings” you can see zoom trigger and factor options. Given how small the text ...

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Embedding \(\LaTeX\) in Tumblr

September 18, 2012
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The classic Pythagorean identity is:  \(sin^2(\theta) + cos^2(\theta) =1 \) The binomial formula which calculates the probability of obtaining k tails when flipping a coin n times, with a assumed probability p for each trial is: \( P(E)   = {n \choos...

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Getting data from figures in published papers

September 18, 2012
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Getting data from figures in published papers

The problem: There are a lot of figures in published papers in the scholarly literature, like the below, from (Attwood et. al. 2012)): At some point, a scientist wants to ask a question for which they can synthesize the knowledge on that question b...

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Using R in Insurance at GIRO 2012

September 17, 2012
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Using R in Insurance at GIRO 2012

Every year the UK’s general insurance actuarial community organises a big conference, which they call GIRO, short for General Insurance Research Organising committee. This year's conference is in Brussels from 18 - 21 September 2012. Despite the fac...

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Copulas and tail dependence, part 1

September 17, 2012
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Copulas and tail dependence, part 1

As mentioned in the course last week Venter (2003) suggested nice functions to illustrate tail dependence (see also some slides used in Berlin a few years ago). Joe (1990)'s lambda Joe (1990) suggested a (strong) tail dependence index. For lower t...

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Why are some things easier to forecast than others?

September 17, 2012
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Forecasters are often met with skepticism. Almost every time I tell someone that I work in forecasting, they say something about forecasting the stock market, or forecasting the weather, usually suggesting that such forecasts are hopelessly inaccurate. In fact, forecasts of the weather are amazingly accurate given the complexity of the system, while anyone claiming to forecast the stock...

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Permanent Portfolio

September 17, 2012
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Permanent Portfolio

First, just a quick update: I’m moving the release date of the SIT package a few months down the road, probably in November. Now back to the post. Recently I came across a series of interesting posts about the Permanent Portfolio at the GestaltU blog. Today I want to show you how to back-test the

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In search of large ice floes

September 17, 2012
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In search of large ice floes

In search of large ice floes.

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INLA functions (yet again)

September 17, 2012
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This links back to previous posts here and here. Earlier today, I had a quick chat with Michela (by email, actually) on this topic. In particular, she was trying to use the function I've written to compute summaries from the posterior distrib...

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Start your new relationship with data together with Roger Peng and 30000 other students

September 17, 2012
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Start your new relationship with data together with Roger Peng and 30000 other students

A week from today (on September 24) Coursera, an education technology company committed to making education freely available to any person who seeks it, is launching their online course “Computing

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Podcast interview with Michael Kane

September 17, 2012
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In this podcast interview with Michael Kane, Data Scientist and Associate Researcher at Yale University, Michael discusses the R statistical programming language, computational challenges associated with big data, and two projects involving data analysis he conducted on the stock market "flash crash" of May 6, 2010, and the tracking of transportation routes bird flu H5N1. Michael also...

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Simple Parallel randomForest with doMC package

I have been exploring how to speed up some of my R scripts and have started reading about some amazing corners of R. My first weapon was the Rcpp and RcppArmadillo package. These are wonderful tools and even for someone that has never written c++ before, there are enough to examples and documentation to get started. I...

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Example 10.2: Custom graphic layouts

September 17, 2012
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Example 10.2: Custom graphic layouts

In example 10.1 we introduced data from a CPAP machine. In brief, it's hard to tell exactly what's being recorded in the data set, but it seems to be related to the pattern of breathing. Measurements are taken five times a second, leading to on the o...

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Tips for Making R User Group Videos

September 17, 2012
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Tips for Making R User Group Videos

Today's guest post is from Ron Fredericks, videographer and co-founder of LectureMaker, LLC — ed. I was initially surprised to find R user groups (RUGs) so popular. I filmed my first R session during the 2009 Predictive Analytics World in San Francisco. I filmed several more R user sessions over the past three years along with business/science clients and...

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What is Tony talking about?

September 17, 2012
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What is Tony talking about?

I first experimented with word clouds several years ago and used them to visualise the speeches of Kevin Rudd and Malcolm Turnbull. I have now learned from the Fell Stats blog (via R-Bloggers) that there is an R package for generating word clouds.  The package makes use of tm, a text mining package for R, which I have been

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Olimpic predictions – from an R web service provider’s point of view

September 17, 2012
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Olimpic predictions – from an R web service provider’s point of view

Hello, world!Back in July we have read Markus Gesmann’s great blogpost about a prediction for the 100m final in London. Soon we decided to create similar estimates about the forthcoming events and started to post our results on Facebook.We would like to emphasise again that these kind of extrapolated estimates are rather just for fun and we also think...

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Variability of garch estimates

September 17, 2012
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Variability of garch estimates

Not exactly pin-point accuracy. Previously Two related posts are: A practical introduction to garch modeling garch and long tails Experiment 1000 simulated return series were generated.  The garch(1,1) parameters were alpha=.07, beta=.925, omega=.01.  The asymptotic variance for this model is 2.  The half-life is about 138 days. The simulated series used a Student’s t distribution … Continue reading...

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Create Beamer/knitr Lecture Slideshow with Bash, Explain the Script with knitr

September 17, 2012
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Setting up a beamer slideshow is tedious. Creating new slideshows with the same header/footer/style files every week for your course lectures is very very tedious. To solve this problem I created a simple bash shell script. When you run the script in...

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Scholarly metadata from R

September 17, 2012
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Metadata! Metadata is very cool. It's super hot right now - everybody is talking about it. Okay, maybe not everyone, but it's an important part of archiving scholarly work. We are working on a repo on GitHub rmetadata to be a one stop shop for quer...

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Online Questionnaire & Report Generation with Google Drive & R

September 17, 2012
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Here's how I did it in 3 easy steps: (1) Set up a form in Google Docs/Drive. (2) Choose "Actions" and "Embed in Website" to get the URL for the iframe and put it in a post, like below. Then, go to the spreadsheet view of the form on Google Docs/Drive a...

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Etymology

September 16, 2012
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Chris and I started this blog as an outlet for the work we were already doing every day: writing code and trying to avoid forgetting how we wrote it. To that end, gist.github.com is an extremely useful resource, and this blog allows us to add a little ...

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Changes in optimization performance of gcc over time

September 16, 2012
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Changes in optimization performance of gcc over time

The SPEC benchmarks came out a year after the first release of gcc (in fact gcc was and still is one of the programs included in the benchmark). Compiling the SPEC programs using the gcc option -O2 (sometimes -O3) has always been the way to measure gcc performance, but after 25 years does this way

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The R-Podcast Episode 10: Adventures in Data Munging Part 2

September 16, 2012
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I’m happy to present episode 10 of the R-Podcast! Season 1 of the R-Podcast concludes with part 2 of my series on data munging, in which I discuss issues surrounding importing data sets contained in HTML tables. I share how I used the XML and RCurl packages to validate and import data from hockey-reference.com for

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What’s the smallest amount you can’t make with 5 coins ?

September 16, 2012
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What’s the smallest amount you can’t make with 5 coins ?

My amazing, awesome wife often comes up with the little puzzles for our amazing children, and this one seemed destined to be solved in R. So, using up to 5 coins (1p, 2p, 5p, 10p, 20p and 50p) first she asked our kids whether they could make every val...

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