July 2014

Adjusted Momentum

July 31, 2014 | systematicinvestor

David Varadi has published two excellent posts / ideas about cooking with momentum: VIX-Adjusted Momentum Error-Adjusted Momentum I just could not resist the urge to share these ideas with you. Following is implementation using the Systematic Investor Toolbox. Please enjoy and share your ideas with David and myself. To view the ... [Read more...]

Active Benchmarking in the Cloud

July 31, 2014 | Joyeur Article Feed

Recently, Joyent published a series of benchmarks using YCSB (Yahoo Cloud Service Benchmark) comparing the performance of MongoDB, PostgreSQL, and Elasticsearch between machines running in the Joyent Public Cloud and similarly configured machines running on Amazon Web Services. When I looked at the… [Read more...]

yocto benchmarking

July 31, 2014 | romain francois

Let's start with a picture of a bench, as we're going to do some benchmarking. One of my take home message from useR was that we are going to have to do things in parallel. JJ set the motion with the RcppParallel package. The inceptive example for... [Read more...]

A Data Scientist’s and R User’s Guide to the JSM

July 31, 2014 | Joseph Rickert

by Joseph Rickert The Joint Statistical Meetings (JSM) get underway this weekend in Boston and Revolution Analytics is again proud to be a sponsor. More than 6,000 statisticians and data scientists from around the world are expected to attend and listen to thousands of presentations. It is true that many talks ... [Read more...]

Simulating species abundance data with coenocliner

July 31, 2014 | Gavin L. Simpson

Coenoclines are, according to the Oxford Dictionary of Ecology (Allaby 1998), “gradients of communities (e.g. in a transect from the summit to the base of a hill), reflecting the changing importance, frequency, or other appropriate measure of different species populations”. In much ecological research, and that of related fields, data ... [Read more...]

Insert random NAs in a vector in R

July 30, 2014 | Patrick

I was recently writing a function which was going to need to deal with NAs in some kind of semi-intelligent way. I wanted to test it with some fake data, meaning that I was going to need a vector with some random NAs sprinkled in. After a few disappointing google ... [Read more...]

More Readable Code with Pipes in R

July 30, 2014 | Francis Smart

Several blog posts have made mention of the 'magrittr' package which allows functional arguments to be passed to functions in a pipes style fashion (David Smith ).This stylistic option has several advantages:  1. Reduced requirements of nested par... [Read more...]

Accidental aRt

July 30, 2014 | David Smith

R is a very powerful language for creating custom data visualizations, but during the development process sometimes you make a mistake and things go horribly wrong. But sometime serendipity intervenes, and the (unintended) result can be quite beautiful. Accidental aRt, if you will. Curated by Kara Woo and Erika Mudrak, ... [Read more...]

Refresh Old rCharts+flickr post with httr and pipeR

July 30, 2014 | klr

The R world keeps moving, and I noticed this old post didn’t work anymore, so I have rewritten it to use Hadley Wickham's httr instead of Rflickr for two reasons: Rflickr is not working for me anymore httr is a very helpful package for navigating the "what was scary ... [Read more...]

ideal point graphics, via d3

July 30, 2014 | jackman

I’ve updated some of the graphical displays of the ideal point estimates I serve up here. I’ve rendered some of these in d3, with some rollover lah-de-dah: (1) 113th House ideal points in a long “caterpillar” format; (2) scatterplot of ideal point against Obama 2012 vote in district. Screenshot of the ... [Read more...]

Measuring Fat Loss without the scale

July 30, 2014 | Isomorphismes

@tdhopper posted his self-measurements of weight loss a few months back. I recently decided also that I wanted to lose fat-weight—the infamous “I could stand to be a few kilos lighter”—and I think I came up with a more productive way of thinking about my progress: I’m ... [Read more...]

Plain vanilla BlackJack simulation with R

July 30, 2014 | Mic

Please before continue reading, make sure to read the disclaimer at the bottom of this article. Here is a simulation I run with R in the same period I created the poker one. I have just decided to call it plain vanilla since neither double down or split pairs are ... [Read more...]

Building Interactive Graphs with ggplot2 and Shiny

July 30, 2014 | MilanoR

Some time ago, I was contacted from guys at Packt Publishing. Their just published the Building Interactive Graphs with ggplot2 and Shiny online course and they ask me my (humble) opinion. I am proud of their request, and I will review shortly … Continue reading → [Read more...]
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