Monthly Archives: March 2012

Applying Same Changes to Multiple Dataframes

March 28, 2012
By
Applying Same Changes  to Multiple Dataframes

How to apply the same changes to several dataframes andsave them to CSV: # a dataframea <- data.frame(x = 1:3, y = 4:6)# make a list of several dataframes, then apply function (change column names, e.g.):my.list <- list(a, a)my.list <- lapply(...

Read more »

lubridate: working with date and time in R

March 28, 2012
By
lubridate: working with date and time in R

Working with date and time in R is sometimes tricky. Today I gave lubridate a try and was surprised on how easy it can be. Lubridate is a available on git and on CRAN. There is also a good introduction … Continue reading →

Read more »

AQP Kick-Start

March 27, 2012
By

A fun kick-starter for anyone interested in working with soil profile data in R, via AQP. See in-line comments for details. Up next, profile slicing and aggregation. read more

Read more »

Ruin probability and infinite time

March 27, 2012
By
Ruin probability and infinite time

A couple of weeks ago, I had a discussion with a practitioner, working in some financial company, about ruin, and infinite time. And it remind me a weird result. Well, not a weird result, but a result I found disturbing, at first, when I was a stud...

Read more »

Students: Help improve R with the Google Summer of Code

March 27, 2012
By

The Google Summer of Code project provides funding for students to write and contribute code to open-source projects of interest to Google. And given that R is widely used at Google, it's certainly a project of significant interest. So for the fifth year running the R Project will mentor students as part of GSOC 2012 to develop packages and...

Read more »

R Fell on Alabama–Presentation to Birmingham Open Source

March 27, 2012
By
R Fell on Alabama–Presentation to Birmingham Open Source

Birmingham Open Source Software (BOSS) was kind enough to invite me to do a debut presentation on R.  I had a lot of fun.  Below is the embedded Youtube.  Please let me know how I can improve.  I really appreciate helpful feedback.

Read more »

Twitter Germany will be based in Berlin – Taking a look at the numbers

March 27, 2012
By
Twitter Germany will be based in Berlin – Taking a look at the numbers

What I really love about Twitter is that everything they do seems to be data-based. They’re so data-driven, they even analyze the ingredients of their lunch to ensure everyone at the company is living a healthy lifestyle. So, the decision for Berlin as their German headquarter cannot be a random or value-based decision.

Read more »

Social Network Analysis with R

March 27, 2012
By
Social Network Analysis with R

By Yanchang Zhao, RDataMining.com If you have tried social network analysis or graph mining with R, you might have already come across package igraph before. The package is designed for graphs and network analysis in R. It can handle large … Continue reading →

Read more »

Installing and Running JAGS on Mac OS 10.5.8

March 26, 2012
By
Installing and Running JAGS on Mac OS 10.5.8

JAGS is an alternative to BUGS (WinBUGS or OpenBUGS) for conducting a Bayesian Analysis. It stands for Just Another Gibbs Sampler, and like WinBUGS, it is essentially an MCMC machine that employs a Gibbs sampler so you don’t have to … Continue reading →

Read more »

Installing and Running JAGS on Mac OS 10.5.8

March 26, 2012
By
Installing and Running JAGS on Mac OS 10.5.8

JAGS is an alternative to BUGS (WinBUGS or OpenBUGS) for conducting a Bayesian Analysis. It stands for Just Another Gibbs Sampler, and like WinBUGS, it is essentially an MCMC machine that employs a Gibbs sampler so you don't have to write your own for ...

Read more »