Technically this is Part 2 of Firewall-busting ASN-lookups. However, I said (in Part 1) that Part 2 would be about making a vectorized version and this is absolutely not about that. Rather than fib, I merely misdirect. Moving on… As you can see in Part 1, we have to resort to a system() call ... [Read more...]

Round at the RSS Statistical Computing committee, we were having a chuckle at the prospect of a meeting about Stats In Bed. By which I mean analysis on mobile devices, phones and tablets (henceforth phablets), not some sort of raunchy … Continue reading → [Read more...]

Nate Silver's departure to relaunch FiveThirtyEight.com left a bit of a hole at the New York Times, which The Upshot — the new data journalism practice at the Times — seeks to fill. And they've gotten off to a great start with the new Senate forecasting model, called Leo. Leo was ... [Read more...]

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You all know why MapReduce is fancy – so let’s just jump right in. I like researching data and I like to see results fast – does that mean I enjoy the process of setting up a Hadoop cluster? No, … Continue reading → [Read more...]

Searching for SignificanceI just wanted to give a shout out to check out this post by Bob Muenchen on his excellent blog r4stats.com for his exceptional post a little over a year ago entitle "R Handles Big Data". [Read more...]

Controlled experiments embody the best scientific design for establishing a causal relationship between changes and their influence on user-observable behavior. – Kohavi, Henne, Sommerfeld, “Practical Guide to Controlled Experiments on the Web” (2007) A/B tests are one of the simplest ways of running controlled experiments to evaluate the efficacy of a ... [Read more...]

by Joseph Rickert Pasha Roberts, Chief Scientist at Talent Analytics, is writing a series of articles on Employee Churn for the Predictive Analytics Times that comprise a really instructive and valuable example of using R to do some basic predictive modeling. So far, Pasha has published Employee Churn 201 in which ... [Read more...]

http://blog.quandl.com/blog/mythbusting-dr-copper/ [Read more...]

Preventing escaping in HTML Preventing escaping in HTML

library(xtable)<br>

## <br>## Attaching package: 'xtable'<br>## <br>## The following objects are masked from 'package:Hmisc':<br>## <br>##     label, label<-<br>

library(stringr)<br>library(whisker)<br>

Problem statementBeing a novice in R language, the problem I faced maight be a novice one, but I spent hours working on it. I was working on making a html based report from a database (PostgreSQL), which would gather ... [Read more...]

Election is coming soon in Brazil and this is told to be The Election for both the ruling party and the opposition. However, I don't believe to see any surprise in the reelection plans of the incumbent president, Dilma Rousseff, though all past demonstrations, poorly on economic scorecard, and the ... [Read more...]

I’ve been an editor of JSS for the last few years, and as a result I tend to get email from people asking me about publishing papers describing R packages in JSS. So for all those wondering, here are some general comments. JSS prefers to publish papers about packages ... [Read more...]

This is a short post on one way to bust through your corporate firewall when trying to use the Team CYMRU ASN lookup facility that we presented in our book. Part 2 will show how to create a vectorized version of this code. Most corporate networks aren’t going to allow ... [Read more...]

Well, my last post Exploring Factors with rCharts and factorAnalytics got enough attention to motivate me to pull in some more Asness, Frazzini, Pedersen factors and plot them in some different ways.  The additional factors are US and global UMD (up m... [Read more...]

A few years ago, a former classmate came back to me with a simple problem. He was working for some insurance company (and still is, don’t worry, chatting with me is not yet a reason for dismissal), and his problem was that their dataset was too large to run (... [Read more...]

Over on the Data Driven Security Blog there’s a post on how to use Rcpp to interface with an external library (in this case ldns for DNS lookups). It builds on another post which uses system() to make a call to dig to lookup DNS TXT records. The core ... [Read more...]

by Thomas Dinsmore Regular readers of this blog may be familiar with our ongoing effort to benchmark Revolution R Enterprise (RRE) across a range of use cases and on different platforms. We take these benchmarks seriously at Revolution Analytics, and constantly seek to improve the performance of our software. Previously, ... [Read more...]

The Famous Julia First off, I am not going to talk much about Julia's speed. Everybody has seen the tables and graphs showing how in this benchmark or another, Julia is tens times or a hundred times faster than R.  Most blog posts talking about Julia test the generality of ... [Read more...]

RStudio supplies several servers for hosting user’s apps, e.g. http://www.shinyapps.io/, http://spark.rstudio.com, http://glimmer.rstudio.com. Thanks a lot to RStudio who has contributed many excellent R libraries! I want to set my shiny-server on a virtual private server (VPS), because I have ... [Read more...]

Until now I've always used randomly generated graphs which was completely fine but I've always wanted to use a real graph at some point. And since I'm gonna be sitting in a train for a couple of hours and have a thing for social graphs, I thought it'd be nice ... [Read more...]