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R/Finance[*], the conference devoted to users of R in the financial sector, takes place every year in Chicago. The program has just been announced for R/Finance 2011 (to be held April 29 and 30), and it's jam-packed with talks from on automated trading, financial risk, hedge ratios, stochastic volatility, and much, ... [Read more...]

I’ve written a few times before about how to choose the software you work with, and what you should and should not care about when making those choices. I maintain a page with various resources related to this, if you’re interested, most notably the Emacs Starter Kit for ... [Read more...]

On CRAN, the official web home of all things R it says, R is a free software environment for statistical computing and graphics. Well, that sounds all hunky dory. But let’s take a close look at what this statement really … Continue reading → [Read more...]

Revolution Analytics' Chief Scientist Lee Edlefsen was a presenter at the Structure Big Data conference in New York last week. You can download the slides from his talk, The Coming Revolution in Statistics, here (PDF 418k). In his presentation, Lee states that "R is not only the statistical language of ... [Read more...]

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Are MLB players better hitters now than they were 20 years ago? Revolution Analytics' Joseph Rickert uses R to take a look at the data, and offers an instructive lesson in checking your assumptions for statistical tests in the process -- Ed. Data are everywhere – but, even for simple things, I ... [Read more...]

Owkey, I told you i was going to keep you up to date on my course, so here it is. I needed to gain knowledge on how to flowcytometry. We started with looking at: why would we do Object Oriented Programming and seeing the difference between S3 and S4 mo... [Read more...]

Two new R User Groups have just started up. The first us in Tallahassee, Florida, and their first meeting is on April 10. Spinning to the other side of the globe, the other is in Hobart, the capital of the Australian island state, Tasmania (their first meeting is also on April 8). ... [Read more...]

These graphics look familiar. From the Tor Metrics Portal: "The metrics website uses R to generate custom graphs on demand." See more here: http://metrics.torproject.org/graphs.html. [Read more...]

A violin plot is a combination box plot and a kernel density plot: it starts with a box plot, and adds a rotated kernel density plot to each side of the box plot. You can create violin plots with the vioplot function (from the vioplot package) package in R. When ... [Read more...]

When working with labor economics, we often run into issues with selection on variables of interest. Regressing earnings on years of education to estimate the human capital earnings function makes sense at first blush until we imagine that education is … Continue reading → [Read more...]

Another mathematical puzzle from Le Monde that relates to a broken calculator (skipping the useless tale): Given a pair of arbitrary positive integers (x,y) a calculator can either substract the same integer [lesser than min(x,y)] from both x and y or multiply either x or y by 2. ... [Read more...]

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Yesterday I tried to insert some more R code into knime. scatterplot smoothed density library("geneplotter")  ## from BioConductor require("RColorBrewer") ## from CRAN x1  [Read more...]

So today I’m going to follow another R-course which is supposed to tell me more about Flowcytometry in R. I’ll keep you up to date [Read more...]

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Part 1. Finding alpha. The first question to resolve in Exercise 3 is to pick a good learning rate alpha. This require making an initial selection, running gradient descent and observing the cost function. Read More: 221 Words Totally [Read more...]

If you're planning to attend the worldwide R user conference useR! 2011, don't forget that April 1 (this Friday) is the deadline for submitting abstracts for contributed talks and posters. Early-bird discounts for attendee registrations expire on Friday as well. (Revolution Analytics is a proud sponsor of useR! 2011, and chief scientist Lee ... [Read more...]