March 2015

Simulation and relative performance

March 24, 2015 | Pete

There’s been some nice posts on randomness the last week or so, in particular here and here. I would like to look at how we can use simulations to get a better understanding of how some aspect of a trading system holds up relative to a bunch of random ... [Read more...]

Hash Table Performance in R: Part I

March 24, 2015 | Jeffrey Horner

What Is It?A hash table, or associative array, is a well known key-value data structure. In R there is no equivalent, but you do have some options. You can use a vector of any type, a list, or an environment.But as you’ll see with all of these ...
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Bio7 2.0 for Windows 32 bit Release

March 24, 2015 | » R

24.03.2015 Because of some requests of a Windows 32 bit version of Bio7 2.0 I uploaded a built to sourceforge. Release notes: Updated R to version 3.1.3 Updated ImageJ to version 1.49p Added some ImageJ dialog options (to stay on top, e.g., the ROI Manager) Updated Java to version 1.8.40 Updated the JavaFX embedded ... [Read more...]

R in genomics @ SciLifeLab, Solna

March 24, 2015 | mrtnj

Dear diary, I went to the Stockholm R useR group meetup on R in genomics at the Stockholm node of SciLifeLab. It was nice. If I had worked a bit closer I would attend meetups all the time. I even got to be pretentious with my notebook while waiting for ...
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3d surface plots with RStudio and Plotly

March 24, 2015 | chelsea

Recently you may have seen how to build a 3d surface plot with Plotly and IPython notebook. Here you can learn the basics of creating a 3d surface plot with Plotly in RStudio. Just add the Plotly library into your RStudio environment then add a Plotly username and key: install.... [Read more...]

Mirror, mirror … the best batsman of them all?

March 24, 2015 | Tinniam V Ganesh

“Full many a gem of purest serene The dark oceans of cave bear.” Thomas Gray – Elegy in country churchyard In this post I do a fine grained analysis of the batting performances of cricketing icons from India and also from the international scene to determine how they stack up against ...
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ChainLadder 0.2.0 adds Solvency II CDR functions

March 24, 2015 | Markus Gesmann

ChainLadder is an R package that provides statistical methods and models for claims reserving in general insurance.With version 0.2.0 we added new functions to estimate the claims development result (CDR) as required under Solvency II. Special thanks to Alessandro Carrato, Giuseppe Crupi and Mario Wüthrich who have contributed code ...
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Knitr’s best hidden gem: spin

March 24, 2015 | Dean Attali's R Blog

Stop knitting & start spinning - spin can help you write reports much faster and avoid repeating yourself - Anyone who loves the idea of dynamic report generation with R is probably a big fan of knitr and its flagship function - knit. But not many people seem to know about ... [Read more...]

Spliting a Node in a Tree

March 23, 2015 | arthur charpentier

If we grow a tree with standard functions in R, on the same dataset used to introduce classification tree in some previous post, __ MYOCARDE=read.table( + "http://freakonometrics.free.fr/saporta.csv", + head=TRUE,sep=";") __ library(rpart) __ cart library(rpart.plot) __ library(rattle) __ prp(cart,type=2,extra=1) The first step ... [Read more...]

PubMed retraction reporting update

March 23, 2015 | nsaunders

Just a quick update to the previous post. At the helpful suggestion of Steve Royle, I’ve added a new section to the report which attempts to normalise retractions by journal. So for example, J. Biol. Chem. has (as of now) 94 retracted articles and in total 170 842 publications indexed in PubMed. ... [Read more...]

Tomorrow, 10AMPT: Live webinar on "checkpoint" package

March 23, 2015 | David Smith

A quick heads-up that tomorrow (Tuesday) at 10AM Pacific Time I'll be giving a live (and free) webinar: Reproducibility with Revolution R Open and the Checkpoint Package. I'll show you how to use the latest version of the checkpoint package to write R scripts without having to worry about unexpected ... [Read more...]

Hypothesis Testing: Fishing for Trouble

March 23, 2015 | tobias

Monday 23 March 2015 - 14:50 Introduction "Can you check if this is significant?" It was a seemingly innocuous question from a dangerous source: a semi data-literate scientist. The kind who believed, deep in his heart, that small p-values were ... [Read more...]

Release of psd 1.0 to CRAN

March 23, 2015 | brobar

Greetings, Interweb! I’m pleased to announce psd 1.0, a long-overdue major update from the 0.* series which includes significant advancements in performance, improved clarity and consistency of documentation and method/class handling, and the elimination a few long-standing bugs. Some major changes include: … Continue reading →
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News So Far for Geomorph v2.1.4beta

March 23, 2015 | Emma Sherratt

Dear geomorph users,we have so far recognised and fixed the following bugs known to be in geomorph v.2.1.3 on CRAN, and these are available in the GitHub repository of v.2.1.4beta:  BUG FIXES    Corrected error readland.tps() "Error... [Read more...]

Remove leading 0 with ggplot2.

March 22, 2015 | Educate-R - R

I recently had an occasion while working on a three variable interaction plot for a paper where I wanted to remove the leading 0's in the x-axis text labels using ggplot2. This was primarily due to some space concerns I had for the x-axis labels. Unfor... [Read more...]
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