Creating reports is one of the basic tasks in data analysis. R provides numerous functions and packages to export it’s (beautiful) output and help compile it into a report. In this post I will present one such (basic) solution for Windows OS users for exporting R output into Microsoft ... [Read more...]

So, as you may have noticed from the new banner here at the blog, we've changed our name to Revolution Analytics. It's still the same company and the same people, and still focused around the R Project, but now with a fresh new look and lots of exciting news. I'll ... [Read more...]

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A few weeks ago I covered an R package for efficient mixed model regression that is capable of simultaneously accounting for both population stratification and relatedness to compute unbiased estimates of standard errors and p-values for genetic associ... [Read more...]

I came up with a handy little trick for programming in R. I like to define a lot of variables all at once without worrying about what order they’re in. The goal would be something like this: K  = -R2/R1 … Continue reading → [Read more...]

The mathematical puzzle in the latest weekend edition of Le Monde is as follows: Two kids are given three boxes of chocolates with a total of 32 pieces. Rather than sharing evenly, they play the following game: Each in turn, they pick one of the three boxes, empty its contents in ... [Read more...]

Before I decided to learn R in a serious way, I thought about learning Flash/Actionscript instead. Most of my work involves evolutionary models that take place over time. I need visual representations of change. It’s certainly possible to represent change and tell an evolving story with a single ... [Read more...]

Jeromy Anglim has just posted a nice round-up of instructional videos for learning R. The videos are categorized into four levels: What is R? Introductory R? Intermediate and Advanced Materials on R and Related Resources (including a link to written resources for getting started with R). Check out all the ... [Read more...]

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In baseball, what are the chances the winner will win again against the same opponent the very next day? [Read more...]

Below is a walk-through of some of the basics of customizing plot in R. These are all based on the graphics package that comes in the base installation of R. Let’s start by making a basic plot in R. In the code snippets below, green text behind a... [Read more...]

An email from Keith I got this morning: Professor Robert, I have loaded the mcsm package to windows. The following messages appear in the R console: trying URL 'http://cran.stat.ucla.edu/bin/windows/contrib/2.9/mcsm_1.0.zip' Content type 'application/zip' length 193590 bytes (189 Kb) opened URL downloaded 189 Kb package ... [Read more...]

The following fully-automatic Bash script downloads, compiles, and initializes compcache version 0.6.2 on Ubuntu Karmic Koala (9.10). This script creates two swaps with a maximum of 4GB uncompressed size each. Two swaps are used to take advantage of 2 CPUs (or CPU cores in a multicore CPU). Compcache is a fascinating memory compression ... [Read more...]

To start sending all output to a file, do this: sink("path/to/filename") # Direct all output to file print("Hi there") # Will be printed to file sink() # Turn off buffing to file Related to this I recently had to use: flush.console() This forces your console to print out ... [Read more...]

Wishing there was a local R User's group in your area, but can't find one? New user groups are springing up all the time, but you can kickstart the process by registering interest for a group in your area at meetup.com. As you can see from the map below, ... [Read more...]

In the past few months, I've developed a set of functions for automating model estimation and interpretation using Mplus, an outstanding latent variable modeling program that has unparalleled flexibility for complex models (e.g., factor mixture models). I recently rolled these functions into an R package called MplusAutomation. Because the ... [Read more...]

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This guest article was written by author and consultant Tristan Yates (see his bio below). It emphasizes R's data object manipulation and scoring capabilities via a detailed financial analysis example. Scoring and ranking systems are extremely valuabl... [Read more...]

JD Long (of Cerebral Mastication fame) will be giving a live "virtual talk" introducing R: "What it's best at and how you can use it to help you massage data". The talk will be at 7:30PM Pacific time tomorrow, Tuesday May 4. You can register at the link below. vconf.org: ... [Read more...]