## R programming challenge: Escape the zombie horde

May 20, 2013
By

So when the world is taken over by a Zombie horde, you're going to want to figure out a way to get the human population to safety. This R script by econometrician Francis Smart won't help you do that exactly, but given a list of waypoints to navigate through zombie-infested lands to a safe house, it will tell you...

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## Solving Multiple Supplier Selection Problem using R and LP Solve

May 20, 2013
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(This article was first published on Enterprise Software Doesn't Have to Suck, and kindly contributed to R-bloggers) To leave a comment for the author, please follow the link and...

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## R 3.0.1 is released

May 20, 2013
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R 3.0.1 (codename “Good Sport”) was released last week. As mentioned earlier by David, this version improves serialization performance with big objects, improves reliability for parallel programming and fixes...

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## Non-Verbal Reasoning Test – Concerto

May 20, 2013
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I have just released my first complete test of non-verbal problem solving skills.  It is run on Concerto (an R-based application development platform targeted at primarily test developers)  Try...

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## More on Chutes & Ladders

May 20, 2013
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Matt Maenner asked about the sawtooth pattern in the figure in my last post on Chutes & Ladders. Damn you, Matt! I thought I was done with this. Don’t...

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## Model fitting exam problem

May 20, 2013
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Recently I have run an exam where the following question had risen many problems for students (here I give its shortened formulation). You are given the data generating process...

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## qdap 0.2.2 released

May 20, 2013
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I’m very pleased to announce the release of qdap 0.2.2 This is the third installment of the qdap package available at CRAN. The qdap package automates many of the...

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## analyze the new york city housing and vacancy survey (nychvs) with r

May 19, 2013
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for those interested in the real estate and rental markets of the big apple, the census bureau's nyc housing and vacancy survey might be your key to the city. ...

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## Playing cards in Vegas?

May 19, 2013
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In a previous post, a few weeks ago, I mentioned that I will be in Las Vegas by the end of July. And I took the opportunity to write...

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## More tide prediction with R

May 19, 2013
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In the previous post I outlined how to query the XTide software with R and parse the results into a handy-dandy data frame. The biggest hurdle with that method...

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## R code to obtain and plot rainfall data for the whole world

If you want to create rainfall maps for the whole world in R there is no readily available code or package to do this. Moreover, data publicly available from...

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## Update to PSID panel builder for R: psidR

May 19, 2013
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I just pushed the most recent version of the PSID panel data builder introduced a little while ago. Got some user feedback and made some improvements. The package is...

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## Sharing my R notes

May 18, 2013
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I started working with R 2 1/2 years ago. I remember opening R closing it and thinking it was the dumbest thing ever (command line to a non programmer...

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## R (Web Server) Solutions – Amplifying Artichokes

May 18, 2013
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Every month I see one or more new R based web server solutions coming into the market, sight seeing some of them thought of sharing one of my old...

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## What is probabilistic truth?

May 18, 2013
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I am currently working on a validation metric for binary prediction models. That is, models which make predictions about outcomes that can take on either of two possible states...

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## Recent Changes to caret

May 18, 2013
By

Here is a summary of some recent changes to caret.

Feature Updates:

• `train` was updated to utilize recent changes in the gbm package that allow for boosting with...

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## Wiekvoet 2013-05-18 02:26:00

May 18, 2013
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I was reading Paul Hiemsta's blogpost on Much more efficient bubble sort in R using the Rcpp and inline packages, went back to his first post  Bubble sort implemented in pure...

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## Interfacing XTide and R

May 17, 2013
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XTide is an open-source program that predicts tide heights and current speeds for hundreds of tide and current stations around the United States. It can be used to produce...

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## Unit conversion in R

May 17, 2013
By

Last weekend I submitted an update of my R package `datamart` to CRAN. It has been more than a half year since the last update, however there are only...

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## Chutes & ladders: How long is this going to take?

May 17, 2013
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I was playing Chutes & Ladders with my four-year-old daughter yesterday, and I thought, “How long is this going to take?” I saw an interesting mathematical analysis of the...

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## Which Torontonians Want a Casino? Survey Analysis Part 2

May 17, 2013
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In my last post I said that I would try to investigate the question of who actually does want a casino, and whether place of residence is a factor...

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## R 3.0.1 released

May 17, 2013
By

The R core group has quickly followed up with a patch to R version 3. Announced yesterday, R 3.0.1 (code name: "Good Sport") improves serialization performance with big objects,...

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## Revolution Newsletter: May 2013

May 17, 2013
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The most recent edition of the Revolution Newsletter is out. The news section is below, and you can read the full May edition (with highlights from this blog and...

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## Strategic Zombie Simulation – Animation – Jimmy’s Down

May 17, 2013
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# Escape Zombie Land!# This is a simulation an escape from a hot zombie zone.  It freezes and gives an error if you get get killed so you had...

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## Innovation Will Never Be At The Push Of A Button

May 17, 2013
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@randyzwitch @benjamingaines @usujason I am envisioning the data science equivalent of an autonomous vehicle pileup. — Todd Belcher (@toddmetrics) May 16, 2013   Recently, I’ve been getting my blood...

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## Preferential attachment applied to frequency of accessing a variable

May 17, 2013
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If, when writing code for a function, up to the current point in the code distinct local variables have been accessed for reading times (), will the next read...

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## Analyzing a simple experiment with heterogeneous variances using asreml, MCMCglmm and SAS

May 17, 2013
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$Analyzing a simple experiment with heterogeneous variances using asreml, MCMCglmm and SAS$

I was working with a small experiment which includes families from two Eucalyptus species and thought it would be nice to code a first analysis using alternative approaches. The...

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## Finding patterns in time series using regular expressions

May 17, 2013
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Regular expressions are a fantastic tool when you’re looking for patterns in time series. I wish I’d realised that sooner. Here’s a timely example: traditionally, when you have two...

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## Social Network Analysis at New Frontiers in Computing 2013

May 16, 2013
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by Joseph Rickert This past Saturday, the New Frontiers in Computing Conference (NFIC 2013), held at Stanford University, explored the theme: Social Network Analysis: It’s Who You Know. The...

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