# Monthly Archives: March 2012

## useR!2012 – student’s scholarship for attending the conference

March 28, 2012
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Good news for students wishing to attend the annual useR conference (useR!2012). Through generous sponsor support (ASA, and RStudio), a limited number of student scholarships1 are available for reimbursement of travel and registration costs up to \$500. The allocation will be based on merit and need. Students who wish to apply should send an application to Tatsuki Koyama ([email protected]) no later than...

## Applying Same Changes to Multiple Dataframes

March 28, 2012
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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(...

## lubridate: working with date and time in R

March 28, 2012
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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 →

## AQP Kick-Start

March 27, 2012
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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

## R: ifelse statements with multiple variables and NAs

March 27, 2012
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ifelse statements in R are the bread and butter of recoding variables. Normally these are pretty easy to do, particularly when we are recoding off one variable, and that variable contains no missing values. There are lots of examples on how to do this ...

## Ruin probability and infinite time

March 27, 2012
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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...

## Students: Help improve R with the Google Summer of Code

March 27, 2012
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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...

## R Fell on Alabama–Presentation to Birmingham Open Source

March 27, 2012
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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.

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

March 27, 2012
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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.

## Social Network Analysis with R

March 27, 2012
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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 →