Online courses (in R, python, and data science) at Udemy for only $10 – until September 1st – last day!
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R 2.15.3 is released
Follows is the announcement today from Peter Dalgaard, for the R Core Team: The build system rolled up R-2.15.3.tar.gz (codename “Security Blanket”) at 9:00 [Read more...]
Project Euler — problem 24
It’s a lovely day. I took a walk around the campus after lunch. The scene was enjoyable in one deep autumn day. Before the afternoon work, I’d like to spend a few moments on the 24th Euler Problem. A permutation is an ordered arrangement of … Continue reading → [Read more...]
Drawdown Determined Position Size
This caught my eye as I searched for some more academic research on my favorite risk measure drawdown. Yang, Z. George and Zhong, Liang,Optimal Portfolio Strategy to Control Maximum Drawdown - The Case of Risk Based Dynamic Asset Allocation (February ...
Genome annotation with NCBI2R
It's very convenient manage data with R: you can import your dataset, you could find many packages which respond to your needs, then you could plot your results. However it could be very bothersome retrieve the data from online databases. … Continue reading → [Read more...]
Which programming language is the most concise?
An expressive programming language allows developers to implement algorithms quickly, by using high-level concepts and leaving the details to the language implementation. The result is clearer, more maintainable code that can be created in less time. (Although shorter code isn't always better, especially when taken to extremes.) So which programming ... [Read more...]
Revolution Newsletter: November 2012
The most recent edition of the Revolution Newsletter is out. The news section is below, and you can read the full November edition (with highlights from this blog and community events) online. You can subscribe to the Revolution Newsletter to get it monthly via email. Now Available: Revolution R Enterprise 6.1 ... [Read more...]
Create elegant, interactive presentations from R with Slidify
If you often find yourself cutting-and-pasting charts or tables generated in R into PowerPoint or Keynote, you might want to take a look at Slidify. Created by R user Ramnath Vaidyanathan, Slidify is an R package that allows you to use R Markdown to define the slide content and automatically ... [Read more...]
Regime Detection Pitfalls
Today, I want to address some questions that I was getting regarding the Regime Detection post. In the Regime Detection post I showed an example based on the simulated data, and some of you tried to apply this example to actual stocks. There is one big problem that you have ... [Read more...]
Webinar Tomorrow: Big Data Trees and Hadoop Connection in Revolution R Enterprise 6.1
Tomorrow at 9AM Pacific, Revolution Analytics VP of Product Development Sue Ranney will introduce two key Big Data features of the new Revolution R Enterprise 6.1. Now you can train classification and regression trees on data sets of unlimited size, quickly and using the resources of multiple processors and clusters. (This ... [Read more...]
By Joseph Rickert In a recent blog post, David Smith reported on a talk that Steve Yun and I gave at STRATA in NYC about building and benchmarking Poisson GLM models on various platforms. The results presented showed that the rxGlm function from Revolution Analytics’ RevoScaleR package running on a ... [Read more...]
RStudio releases Shiny
Some Thoughts on Teaching R to 50,000 Students
Two weeks ago I finished teaching my course Computing for Data Analysis through Coursera. Since then I’ve had some time to think about how it went, what I learned, and what I’d do differently. First off, let me say that it was a lot of fun.... [Read more...]
Video: How John Deere uses R
Farming equipment manufacturer John Deere uses R, and in yesterday's webinar their manager of forecast analytics, Derek Hoffman, explained what they use it for: In the presentation, Derek gave a spirited argument of why R is critical for John Deere's operations: from forecasting demand for equipment, to forecasting crop yields (... [Read more...]
Video: Overlay Histogram in R (normal, density, another series)
This video explains how to overlay histogram plots in R for 3 common cases: overlaying a histogram with a normal curve, overlaying a histogram with a density curve, and overlaying a histogram with a second data series plotted on a … Continue reading →Video: Overlay Histogram in R (normal, density, another series) ... [Read more...]
Unbelievable and Amazing R Shiny–Web Parameter Test in 1.5 Hours
Life keeps getting better and better. Yesterday, I discovered the absolutely unbelievable and amazing work RStudio has done with Shiny employing one of my favorite R packages websockets. As proof of the ease and quality, within a couple of ...
Here are my R midterm exams, version A and version B in English (as students are sitting next to one another in the computer rooms), on simulation methods for my undergrad exploratory statistics course. Nothing particularly exciting or innovative! Dedicated ‘Og‘s readers may spot a few Le Monde puzzles ... [Read more...]
Project Euler — problem 23
Officially, it’s weekend. I’m solving this 23rd Euler problem just before my supper. A perfect number is a number for which the sum of its proper divisors is exactly equal to the number. For example, the sum of the proper divisors … Continue reading → [Read more...]
R Code for A Justification and Application of Eigenvector Centrality
Leo Spizzirri does an excellent job of providing mathematical intuition behind eigenvector centrality. As I was reading through it, I found it easier to just work through the matrix operations he proposes using R. You can find his paper her...
What’s new in Revolution R Enterprise 6.1
We're pleased to announce that the latest update to Revolution R Enterprise is available today! Existing subscribers will soon receive an email with update instructions, and the free academic distribution will be updated later today. Version 6.1 adds a frequently-requested big-data statistical modeling algorithm, adds new connectivity option for Hadoop, improves ... [Read more...]