April 2011

Video Tutorial on Robust Standard Errors

April 12, 2011 | Tony Cookson

Update: I have included a modified version of this summaryR() command as part of my package tonymisc, which extends mtable() to report robust standard errors. The tonymisc package is available on CRAN through the install.packages() command.If you have...

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Measuring Price Dispersion of Marijuana

April 12, 2011 | Adam.Hyland

The intersection of mapping APIs, fast database operations and user engagement offers a lot of very cool crowdsourcing applications ranging from the benign and powerful (Google’s Person Finder) to the minor and questionable (A DUI checkpoints app). Most intriguing in … Continue reading → [Read more...]

Using R + Bioconductor to Get Flanking Sequence Given Genomic Coordinates

April 12, 2011 | Stephen Turner

I'm working on a project using next-gen sequencing to fine-map a genetic association in a gene region. Now that I've sequenced the region in a small sample, I'm picking SNPs to genotype in a larger sample. When designing the genotyping assay the lab wi... [Read more...]

Example 8.34: lack of robustness of t test with small n

April 12, 2011 | Nick Horton

Tim Hesterberg has effectively argued for a larger role for resampling based inference in introductory statistics courses (and statistical practice more generally). While the Central Limit Theorem is a glorious result, and the Student t-test remarkabl...

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The new R compiler package in R 2.13.0: Some first experiments

April 12, 2011 | Thinking inside the box

R 2.13.0 will be released tomorrow. It contains a new package by R Core member Luke Tierney: compiler. What a simple and straightforward name, and something that Luke has been working on for several years. The NEWS file says o Package compiler is now provided as a standard package. See ?compiler::... [Read more...]

Wilcox’s Robust Statistics: A new R package

April 12, 2011 | FelixS

Recently I started to build a new package for R containing Wilcox’ collection of functions for robust statistics. Wilcox provides 700+ functions for robust statistics, including: robust correlations (e.g. percentage bend correlation) robust measures of location and mean differences (e.g. … Continue reading → [Read more...]

Box Plot with ggplot2

April 12, 2011 | Fabio Veronesi

Hi,in these days I'm creating lots and lots of box plot with ggplot2.The look of them is really good and you can change every bit of code so that you can customize the plot completely.Here is the code I'm using with a test data file to try ... [Read more...]

Historical Sources of Bond Returns with Shiller Data 1919-2011

April 11, 2011 | klr

And as usual, I always want a longer data set, so after a little playing with R-Excel, we can extend our historical sources of bond returns to 1919. If nothing else, maybe you can find other uses for the Shiller Dataset in R. From TimelyPort...

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Rstudio updates to beta 2

April 11, 2011 | David Smith

The folks over at Rstudio have released a new update to their open-source R GUI, currently in beta test. This Beta 2 release adds more customizable layouts, editor improvements and new editing themes. Also of interest is a new feature that allows creation of graphics that update under the control of ... [Read more...]

EC2 AMI for scientific computing in Python and R

April 11, 2011 | Drew Conway

Like many people who crunch numbers frequently, I have increasingly been integrating Amazon’s cloud computing services into my daily workflow. In particular, I have been using their elastic cloud computing (EC2) on a regular basis. The service is an excellent way to offload computationally intensive work from your laptop ... [Read more...]

Historical Sources of Bond Returns

April 11, 2011 | klr

As promised in Monitoring Sources of Bond Return, we can show more history if we use CPI instead of expected inflation (from the TIP inflation breakeven yield). Here are the results with history back to 1953. From TimelyPortfolio However, mo...

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Monday Links: 23andMe, RStudio, PacBio+Galaxy, Data Science One-Liners, Post-Linkage RFA, SSH

April 11, 2011 | Stephen Turner

Lately I haven't written as many full length posts as usual, but here's a quick roundup of a few links I've shared on Twitter (@genetics_blog) over the last week:First, 23andMe is having a big DNA Day Sale ($108) for the kit + 1 year of their personal ...

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Tumblr Likes

April 11, 2011 | Mathematical Poetics

Look at just the first digit and the number of digits. science: 32914, 11566, 4989, 3743, 968, 814, 673, 482, 286, 2811 black and white: 1694, 1167, 1108, 988, 919, 639, 596, 591, 580, 544 lol: 22627, 18100, 17688, 14374, 13459, 12045, 4711, 3779, 36... [Read more...]

Article about plyr published in JSS, and the citation was added to the new plyr (version 1.5)

April 11, 2011 | Tal Galili

The plyr package (by Hadley Wickham) is one of the few R packages for which I can claim to have used for all of my statistical projects. So whenever a new version of plyr comes out I tend to be excited about it (as was when version 1.2 came out with ... [Read more...]

R and Java – JRI using eclipse on 64 bit machines

April 11, 2011 | R – StudyTrails

Update – Check out the new RJava Eclipse Plugin.The steps to install rjava on a 64 bit machine is not very different from installing it on a 32 bit machine. however, here are the exact steps. 1. Install 64 bit java.2. Install R 2.12.X3. Start R and install the rjava package using the package ... [Read more...]

Vienna, May 2011 – Advanced Topics in Financial Econometrics Lectures

April 11, 2011 | wuertz

[This article was first published on Rmetrics blogs, and kindly contributed to R-bloggers]. (You can report issue about the content on this page here) Want to share your [Read more...]

Speeding tickets for R and Stata

April 10, 2011 | Murtaza Haider

How fast is R? Is it as fast in executing routines as the other off-the-shelf software, such as Stata? After some comparative experimentation, I found Stata to be 5 to 8 times faster than R. For me, speed has not been a concern in the past. I had used R with smaller ... [Read more...]

Video Tutorial on IV Regression

April 10, 2011 | Tony Cookson

Update: [1 May 2011] I am working on a better augmentation of the current IV regression functions (specifically ivreg() in AER) in R. I will post a link here to my new method/function for IV regression when I finish debugging the code.Update 2: [15 Ma...

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Quality comparison of floating-point maths libraries

April 10, 2011 | Derek-Jones

What is the best way to compare the quality of floating-point math libraries (e.g., sin, cos and log)? The traditional approach for evaluating the quality of an algorithm implementing a mathematical function is based on mathematics; methods have been developed to calculate the maximum error between the calculated and ... [Read more...]

Mixtures in Madrid

April 10, 2011 | xi'an

As I already did two years ago, in connection with the double degree between UAM and Dauphine, I will give a short graduate course at the Universidad Autonoma de Madrid (UAM). It will be part of the regular fourth year statistics course and will focus on mixtures, as given in ... [Read more...]

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April 2011

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