May 2011

A dubious statistics

May 31, 2011 | xi'an

Following a link on R-bloggers, I ended up on this page (with a completely useless graph that only contained the pieces of information 5% in 1900 and 55% in 2000). The author (Ralph Keeney) reports on “A remarkable 55 percent of deaths for people age 15 to 64 can be attributed to decisions with readily [...] [Read more...]

Overoptimizing Chicago Fed

May 31, 2011 | klr

THIS SHOULD BE OBVIOUS THROUGHOUT THE POST BUT THIS IS NOT INVESTMENT ADVICE.  PLEASE DO NOT FOLLOW THIS SYSTEM AS IT COULD RESULT IN SERIOUS LOSSES. One of the perils of system-building is the tendency to unintentionally overoptimize by playing/r...
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ARMA Models for Trading, Part IV

May 31, 2011 | The Average Investor

All posts in this series were combined into a single, extended tutorial and posted on my new blog. The last post promised to show some back testing results for the ARMA techniques. I decided to use the S&P 500 index for this purpose. What really impresses me in the above ... [Read more...]

The Netflix Prize, Big Data, SVD and R

May 31, 2011 | David Smith

One of the key data analysis tools that the BellKor team used to win the Netflix Prize was the Singular Value Decomposition (SVD) algorithm. As a file on disk, the Neflix Prize data (a matrix of about 480,000 members' ratings for about 18,000 movies) was about 65Gb in size -- too large ... [Read more...]

An unsurprising year

May 31, 2011 | CL

I’ve received one those FW:…:FW emails yesterday with the following text: 2011 is an unusual year. Add the last two digits of your birth year to the age you will turn on your birthday this year and you’ll get 111! … Continue reading → [Read more...]

Go Guerrill-R on Your Data

May 31, 2011 | Neil Gunther

The Guerrilla Data Analysis Techniques training course (GDAT) will be held during the week of August 8-12 this year. As usual, the focus will be on applying R to your performance and capacity planning data, as well as how to use the PDQ-R modeling too... [Read more...]

Recreational R: Simulating a Card Trick

May 30, 2011 | Tony Cookson

In this post, I simulate an interesting card trick, which was described by a friend of mine named Xan. Here's Xan's description of the card trick:I put a deck of cards down face up on the table. Meanwhile you think of a secret number between 1 and 1...
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digest 0.5.0

May 30, 2011 | Thinking inside the box

A new version of the digest package (which generates hash function summaries for arbitrary (and possibly nested) R objects using any of the standard md5, sha-1, sha-256 or crc32 algorithms) is now on CRAN. Thanks to a patch by Mario Frasca, digest ... [Read more...]

XLConnect 0.1-4

May 30, 2011 | Mirai Solutions

Mirai Solutions GmbH (http://www.mirai-solutions.com) is pleased to release XLConnect 0.1-4. In the time since our first release (XLConnect 0.1-3, released on Feb 28, 2011) we received very positive and constructive feedback from the R community which heavily influenced the development … Continue reading → [Read more...]

Searching for inaccurate literals in R

May 29, 2011 | Derek-Jones

In creating the numbers tool I wanted to be able to do two things, 1) obtain information about what source did by matching the numeric literals it contained against a database of ‘interesting’ values (now with over 14,000 entries) and 2) flag possible incorrect numeric literals (e.g., 3.1459265 when 3.14159265 had been intended in ... [Read more...]

R/Finance 2011 Presentations are online

May 29, 2011 | Joshua Ulrich

For those of you who don't subscribe to the R-SIG-Finance mailing list: You really should subscribe ;-) Dirk Eddelbuettel announced the R/Finance 2011 presentations are now available. I've included the entire announcement (with some hyperlinks) below.The organizing committee for the R/Finance 2011 conference is pleased to announce the availability ... [Read more...]

Dicetributions – episode I

May 29, 2011 | infominer

Suppose the following game with two players: In every round, the two players pick a random number, each. Instead of using a dice, they pick a number from an interval. Player A picks a number from [9,11] and player B from [8,12]. Variation 1. The greater number wins. Who is more likely to ... [Read more...]
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