May 2012

NYT charts the Facebook IPO with R

May 23, 2012 | David Smith

In conjunction with Facebook's record-setting IPO last Thursday, the New York Times created an infographic to put the size of the offer in context with other recent IPOs. A detail of the graphic as it appeared in the print edition appears below: ChartsNThings gives a fascinating peek into the weeklong ... [Read more...]

Global Fires, the Amazon and Humans

May 23, 2012 | Patrick Rhodes

Fires are natural - most of the time (click on image for larger view). Natural Global Fires Many plants and animals have evolved to depend on fires periodically occurring in certain parts of the world. This phenomenon has been occurring for... [Read more...]

R-NOLD 2012-05-23 05:48:00

May 23, 2012 | arsalvacion

Mapping Global Earthquake using XML and MaptoolsEveryday the US Geological Survey (USGS) publish earthquake data (http://earthquake.usgs.gov/earthquakes/recenteqsww/Quakes/quakes_all.html) all over the globe. Using XML and maptool packages of R I d...
[Read more...]

My On-Job Training Analytics

May 22, 2012 | Al-Ahmadgaid Asaad

I have been working at Provincial Statistics Office of Tawi-Tawi (Philippines) which was part of the training on my OJT (On-Job Training). One of the requirements of the training is at least 80 hours of services, so I decided to work from April 19 to M...
[Read more...]

My new forecasting textbook

May 22, 2012 | Rob J Hyndman

After years of saying that I was going to write a book to replace Makridakis, Wheelwright and Hyndman (1998), I’m finally ready to make an announcement! My new book is Forecasting: principles and practice, co-authored with George Athanasopoulos. It is available online and free-of-charge. We have written about 2/3 of the ... [Read more...]

The grade level of Congress speeches, analyzed with R

May 22, 2012 | David Smith

As widely reported by CNN, the Huffington Post, Talking Points Memo, the sophistication of speeches by US politicians has declined in recent years, dropping from an 11th-grade level in 2005 to a 10th-grade level today. The reports are based on an analysis by the Sunlight Foundation, based on textual analysis of ... [Read more...]

knitr Performance Report–Attempt 3

May 22, 2012 | klr

please see knitr Performance Report-Attempt 2 and knitr Performance Report-Attempt 1 Since the time of my last reporting post, RStudio, knitr, and Sweave have worked extremely hard to make document creation easier by becoming even more streamlined and ...
[Read more...]

Adding watermarks to plots

May 22, 2012 | ggplot2

A question was raised today on the mailing list: Is there an easy way to add a watermark to a ggplot? There are several options, depending on the type of watermark and the required level of control over the output, add a text label using annotate (th... [Read more...]

Correlations and postive-definiteness

May 22, 2012 | Pat

On the way to another destination, I found some curious behavior with average correlations. The data Daily log returns from almost all of the constituents of the S&P 500 for years 2006 through 2011. The behavior Figure 1 shows the actual mean correlation among stocks for the set of years and the mean ... [Read more...]

LME summary data – results table

May 21, 2012 | nzcoops

UPDATE: Based on the comment from ‘linuxizer’, I’ve updated this to stay inline with the S3 classes, something I didn’t have my head around at the time, still don’t know it inside out. Brief post. One thing I do often … Continue reading → [Read more...]

Classical Technical Patterns

May 21, 2012 | systematicinvestor

In my presentation about Seasonality Analysis and Pattern Matching at the R/Finance conference, I used examples that I have previously covered in my blog: Month of the Year Seasonality – I introduced the Seasonality charts in the Historical Seasonality Analysis: What company in DOW 30 is likely to do well in ... [Read more...]

A visual data summary for data frames

May 21, 2012 | David Smith

If you want to get a quick numerical summary of a data set, the summary function gives a nice overview for data frames: __ require(ggplot2) Loading required package: ggplot2 __ data(diamonds) __ summary(diamonds) carat cut color clarity depth table Min. :0.2000 Fair : 1610 D: 6775 SI1 :13065 Min. :43.00 Min. :43.00 1st Qu.:0.4000 Good : 4906 E: 9797 VS2 :12258 1... [Read more...]

Inferring the community structure of networks

May 21, 2012 | sieste

I continue my little excursion into network science. In the last post, I gave a little introduction to simulating and visualizing undirected networks with community structure in R. In this post I want to explore a method to infer the community structure of a network from its adjacency matrix. That ... [Read more...]
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