August 2013

RcppArmadillo 0.3.910.0

August 15, 2013 | Thinking inside the box

A new minor release 3.910.0 of Armadillo came out a few days ago. A new RcppArmadillo release 0.3.910.0 was provided rightaway, and after a brief back-and-forth with CRAN (mostly having to do with the non-standard vignette corresponding to our CSD... [Read more...]

sapply is my new friend!

August 15, 2013 | inkhorn82

I’ve written previously about how the apply function is a major workhorse in many of my work projects. What I didn’t know is how handy the sapply function can be! There are a couple of cases so far where I’ve … Continue reading → [Read more...]

R, drug development and the FDA

August 15, 2013 | Joseph Rickert

by Joseph Rickert When you not directly working in an industry it is often extremely difficult to get any real insight into common practices that may be blindly transparent to people who are. With some persistence though, every once in awhile you can stumble into an opportunity to see why ... [Read more...]

Anomaly Detection Using The Adobe Analytics API

August 15, 2013 | Randy Zwitch

As digital marketers & analysts, we’re often asked to quantify when a metric goes beyond just random variation and becomes an actual “unexpected” result. In cases such as A/B..N testing, it’s easy to calculate a t-test to quantify the difference between two testing populations, but for time-series ... [Read more...]

The “splitstackshape” package for R

August 15, 2013 | Ananda Mahto

A while ago, a friend of ours presented me with a data problem. Her questionnaire had some questions where the respondent could provide multiple responses. You know, the “Check as many as apply” type of questions. One way that this data is commonly stored is to put a comma separated ... [Read more...]

Golf Scramble Simulation in R

August 14, 2013 | The Clerk

Golf Scramble Simulation Golf Scramble SimulationThis is a simulation of a standard best-ball golf scramble. Conventional wisdom has it that the best golfer (A) should hit last, the idea being that one of the lesser golfers may have a decent shot already so the best golfer can take a risky ... [Read more...]

7Twelve Back-test

August 14, 2013 | systematicinvestor

I recently came across the The 7Twelve Portfolio strategy. I like the catchy name and the strategy report, “An Introduction to 7Twelve.” Following is some additional info about the The 7Twelve Portfolio strategy that I found useful: On Israelsen’s 7Twelve Portfolio The 7/12 Allocation Today I want to show how ... [Read more...]

The stats of Australian Rules Football

August 14, 2013 | David Smith

Australian Rules Football (AFL) isn't what Americans know as football. Nor is it what Europeans know as football (and the rest of the world calls soccer). Nor is it rugby. Here's what AFL looks like: As a unique game in its own right, it deserves its own kind of data ... [Read more...]

Fun with R and HMM’s

August 14, 2013 | Wayne

I’m always intrigued by techniques that have cool names: Support Vector Machines, State Space Models, Spectral Clustering, and an old favorite Hidden Markov Models (HMM’s). While going through some of my notes, I stumbled onto a fun experiment with HMM’s … Continue reading → [Read more...]

Shiny

August 14, 2013 | tcamm

I’ve been learning about some new data visualisation tools in R. My three favourite so far are GoogleVis, rCharts and Shiny. Here is a Shiny app I made showing the monthly employment flows of the Australian labour force. [Read more...]

Visualizing Katrina’s strongest winds, with R

August 13, 2013 | David Smith

Here's a new picture of the devastation wrought by Katrina in 2005. This image shows the maximum wind speeds of the hurricane, not at any particular point of time, but over the duration of the entire storm: The data come from NOAA's H*Wind project, which makes windspeed data from sensors ... [Read more...]
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