July 2011

Version 1.3 Verified

July 19, 2011 | Steven Mosher

Whew, For a few hours last night I struggled with a bug, err several bugs. In the end some of the bugs were mine, some of them were “upstream” and some of them were  far “upstream”.  Image  bugs in R 2.13.1. But the math bugs ( or flat out errors on my ... [Read more...]

Growth in data-related jobs

July 19, 2011 | David Smith

At job-search site indeed.com, you can take a look at trends in the use of keywords used in job postings. As you might expect, job postings containing terms related to making sense from data are on the rise. Here's the growth in job postings mentioning big data: And here's ... [Read more...]

Extracting EOD Data from BSE

July 19, 2011 | Market Analyzer

Earlier, I had worked around to download Bhavcopy from NSE. Now, I would make a similar attempt to download the BSE BhavcopyObjective: Download Bhavcopy (Equity) from http://www.bseindia.com and save only relevant columns Date, Symbol, Name, Open, High...
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Extracting EOD Data from NSE

July 19, 2011 | Market Analyzer

My prime interest being the Indian financial markets, the first step would be to get the data to play around. NSE India provides EOD of data as bhavcopies. The same are stored as zipped files at their servers. Downloading them one by one for a larger t...
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The foundations of Statistics [reply]

July 18, 2011 | xi'an

Shravan Vasishth has written a response to my review both published on the Statistics Forum. His response is quite straightforward and honest. In particular, he acknowledges not being a statistician and that he “should spend more time studying statistics”. I also understand the authors’ frustration at trying “to recruit several ... [Read more...]

GigaOm article on R, Big Data and Data Science

July 18, 2011 | David Smith

I'm really pleased that an article I wrote, "5 real-world uses of big data", has been published in the widely-read technology blog GigaOm. In the article, I review five examples of using data science techniques and R to make sense of some large real-world data sets: Drew Conway's analysis of the ... [Read more...]

Registration closing for UseR! 2011

July 18, 2011 | Pat

Friday July 22 is the last day on which you can register for UseR! 2011 at the University of Warwick.  The conference will be 2011 August 16-18. You can peruse the book of abstracts and view the draft schedule. I am scheduled to give a talk on “Random input testing with R”.  The ...
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Model Validation: Interpreting Residual Plots

July 18, 2011 | Daniel Hocking

When conducting any statistical analysis it is important to evaluate how well the model fits the data and that the data meet the assumptions of the model. There are numerous ways to do this and a variety of statistical tests to evaluate deviations from model assumptions. However, there is little ...
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The Road to Default: Puppy Power!

July 18, 2011 | Steven Sabol

Although Congress can technically dilly dally until August 2nd to come up with an agreement and raise the debt ceiling- markets have anticipated the inevitable. They haven't sat back and decided to wait till August 2nd to panic- they are already in "oh...
[Read more...]

1st Data Analysis Contest Using R

July 18, 2011 | Oscar Perpiñán Lamigueiro

Emilio Torres Manzanera has just announced the 1st Data Analysis Contest Using R: “Nestoria (http://www.nestoria.com/) is a specialized web search engine platform in house prices. Nestoria and Lokku Labs aim to improve the understanding of the public of the value of its databases. The company aims to ... [Read more...]

On “Stock correlation has been rising”

July 17, 2011 | Pat

Ticker Sense posted about the mean correlation of the S&P 500. The plot there — similar to Figure 1 — shows that correlation has been on the rise after a low in February. Figure 1: Mean 50-day rolling correlation of S&P 500 constituents to the index. For me, this post raised a whole lot ... [Read more...]

The method in the mirror: reflection in R

July 17, 2011 | richierocks

Reflection is a programming concept that sounds scarier than it is. There are three related concepts that fall under the umbrella of reflection, and I’ll be surprised if you haven’t come across most of these code ideas already, even if you didn’t know it was called reflection. ... [Read more...]
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