May 2014

RcppSMC 0.1.3 and 0.1.4

May 3, 2014 | Thinking inside the box

The very useful Valgrind tool had flagged an actual error in the package which the CRAN maintainers asked us to address. This was followed by a minor brown-bad oversight of a missing delete, also tagged by Valgrind. Both are pretty ancient bugs whic... [Read more...]

Calendar Strategy: Option Expiry

May 2, 2014 | systematicinvestor

Today, I want to follow up with the Calendar Strategy: Month End post. Let’s examine the perfromance Option Expiry days as presented in the The Mooost Wonderful Tiiiiiiime of the Yearrrrrrrrr! post. First, I created two convenience functions for creating a calendar signal and back-testing calendar strategy: calendar.signal ... [Read more...]

Test coverage of the 10 most downloaded R packages

May 2, 2014 | R2D2

Test coverage of the 10 most downloaded R packages 2014-04-30 Source Introduction How do you know that your code is well tested ? The test coverage is the proportion of source code lines that are executed (covered) when running the tests. It is useful to find the parts of your code ... [Read more...]

Reading large data tables in R

May 2, 2014 | fabiomarroni

Ok, I confess. Until yesterday I was one of those still trying to read large data tables using read.table. Then, I came across this thread in stackoverflow and I saw the light. Since I noticed that a lot of people still struggle with read.table I decided to write ... [Read more...]

Playing Threes and 2048 with R

May 2, 2014 | David Smith

I'll say it again: the 2048 game is horribly addictive. Luckily for my productivity, though, I've been playing a lot less of it since I finally managed to complete the game's main goal: combine and double-up like-numbered tiles until you create the ultimate 2048 tile: My strategy? Play the game like Tetris. ... [Read more...]

Multidimensional Scaling (MDS) with R

May 2, 2014 | Yanchang Zhao

This page shows Multidimensional Scaling (MDS) with R. It demonstrates with an example of automatic layout of Australian cities based on distances between them. The layout obtained with MDS is very close to their locations on a map. At first, … Continue reading → [Read more...]

Searching an R Function’s Source Code

May 1, 2014 | wrathematics

This is not nearly as interesting as it might first sound, but every function in R contains R code; this is true of core R code as well as extension packages. Sometimes the R code is just a very shallow wrapper around some compiled code, such as in sum() and ... [Read more...]

RSS statistical analytics challenge 2014

May 1, 2014 | xi'an

Great news! The RSS is setting a data analysis challenge this year, sponsored by the Young Statisticians Section and Research Section of the Royal Statistical Society: Details are available on the wordpress website of the Challenge. Registration is open and the Challenge goes live on Tuesday 6 May 2014 for an exciting 6 ... [Read more...]

A bit of the agenda of Practical Data Science with R

May 1, 2014 | John Mount

The goal of Zumel/Mount: Practical Data Science with R is to teach, through guided practice, the skills of a data scientist. We define a data scientist as the person who organizes client input, data, infrastructure, statistics, mathematics and machine learning to deploy useful predictive models into production. Our plan ... [Read more...]

Importing a log file with rxImport()

May 1, 2014 | Joseph Rickert

by Joseph Rickert Tuesday's post on a new Kaggle contest mentioned that Revolution Analytics offers a free trial for using Revolution R Enterprise in the Amazon cloud. One reason this might be of interest to contestants is the rxImport() function which reads delimited text data, fixed format text data, and ... [Read more...]

Plotting Microtiter Plate Maps

May 1, 2014 | Brian Connelly

I recently wrote about my workflow for Analyzing Microbial Growth with R. Perhaps the most important part of that process is the plate map, which describes the different experimental variables and where they occur. In the example case, the plate map described which strain was growing and in which environment … [Read more...]

SMART Hackathon: Day 1

May 1, 2014 | strictlystat

So day 1 of the #JHUSMARTHack 2014 is over and day 2 is underway. It's been awesome. One student estimated he did “one week's worth of work”. Some interesting (I think) things I thought about: Flooding rain is good weather for coding. (As long as no sinkholes arise) The Admiral Fell Inn is ... [Read more...]

How to Code Something ‘New’ in R

May 1, 2014 | Francis Smart

Programming New Things I currently have been programming in R for more than half a decade and can now fondly look back on the days when I went on a spring break with Venables' little blue book (now out of print).  Back then I was entertained and wowed by R’... [Read more...]

Converting shapefiles to rasters in R

May 1, 2014 | Amy Whitehead

I’ve been doing a lot of analyses recently that need rasters representing features in the landscape. In most cases, these data have been supplied as shapefiles, so I needed to quickly extract parts of a shapefile dataset and convert them … Continue reading → [Read more...]
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