the large half now

October 28, 2012 | xi'an

The little half puzzle proposed a “dumb’ solution in that players play a minimax strategy. There are 34 starting values less than 100 guaranteeing a sure win to dumb players. If instead the players maximise their choice at each step, the R code looks like this: and there are now 66 (=100-34, indeed!) ... [Read more...]

the little half (another Le Monde puzzle)

October 27, 2012 | xi'an

I found this Le Monde puzzle of June 16 I had stored and then somehow forgotten with my trips to Japan and Australia: There are n beans in a box, with 98≤n≤102). Two players take at each round either one bean from the box or “the little half” (i.e. the ... [Read more...]

R 2.15.2 now available

October 26, 2012 | David Smith

As promised, the source distribution for R 2.15.2 is now available for download from the master CRAN repository. (Binary distributions for Windows, MacOS and Linux will be available from the CRAN mirror network in the coming days.) This latest point-update — codenamed "Trick or Treat" — improves the performance of the R engine ... [Read more...]

Modeling Couch Potato strategy

October 25, 2012 | systematicinvestor

I first read about the Couch Potato strategy in the MoneySense magazine. I liked this simple strategy because it was easy to understand and easy to manage. The Couch Potato strategy is similar to the Permanent Portfolio strategy that I have analyzed previously. The Couch Potato strategy invests money in ... [Read more...]

Notes on a Scandal – When Jimmy beat Katy

October 25, 2012 | pssguy

No the title doesn’t refer to how Katy Perry suffered at another of Jimmy Savile’s sexual predelictions, although these are two of  the participants. I’ll get to the details later Just over a year ago, I reflected on the relative wiki searches of leading female singing celebrities, ... [Read more...]

Quick notes from Strata NYC 2012

October 24, 2012 | David Smith

The O'Reilly Strata conferences are always great fun to attend, and this latest installment in New York City is no exception. This one is super-busy though; the conference has been sold out for weeks -- and not just marketing-sold-out, it's fire-department-sold out. It's non-stop conversations and presentations, and it's tough ... [Read more...]

Two Talks on Data Science, Big Data and R

October 23, 2012 | David Smith

On Thursday next week (November 1), I'll be giving a new webinar on the topic of Big Data, Data Science and R. Titled "The Rise of Data Science in the Age of Big Data Analytics: Why Data Distillation and Machine Learning Aren’t Enough", this is a provocative look at why ... [Read more...]

googleVis 0.3.0/0.3.1 is released: It’s faster!

October 23, 2012 | Markus Gesmann

Version 0.3.0 of the googleVis package for R has been released on CRAN on 20 October 2012. With this version we have been able to speed up the code considerably. The transformation of R data frames into JSON works significantly faster. The execution of the gvisMotionChart function in the World Bank demo is ...
[Read more...]

Eight new R User Groups worldwide

October 22, 2012 | David Smith

There are new local R user groups in eight (!) countries to announce this month: Sweden is host to the first R user group in Scandinavia. StockholmR has been holding meetings since September, and their next meeting on November 28 will be on Teaching R and Data visualization using R. In Taiwan, ... [Read more...]

Get an R Data Frame from a MongoDB Query

October 22, 2012 | hrbrmstr

There’s a good FAQ on how to do the MongoDB query -__ R data frame but I wanted to post a more complete example that included the database connection and query setup since I suspect there are folks new to Mongo who would appreciate the end-to-end view. The code ... [Read more...]

Resurrect Posts on Japan and the Yen

October 22, 2012 | klr

As the Yen and Japan continue to get more interesting in my mind, I just wanted to resurrect some posts that I have done on Japan and the Yen and sort them by my favorites. Japan Trade by Geographic RegionJapanese Trade and the YenJapan Intentional or...
[Read more...]

A statistical project bleg (urgent-ish)

October 22, 2012 | leekgroup

We all know that politicians can play it a little fast and loose with the truth. This is particularly true in debates, where politicians have to think on their feet and respond to questions from the audience or from each other.  Usually, we find out a... [Read more...]

Player timelines with ggplot

October 21, 2012 | pssguy

Timelines can be quite a handy way of getting an overview of a player’s career in terms of when they played, with which team and who were their contemporaries As often is the case, I turned to Stackoverflow to set me on my way for an R solution. In ... [Read more...]

Le Monde puzzle (rainy Sunday!)

October 20, 2012 | xi'an

On October 14, the weekend edition of Le Monde had the following puzzle: consider four boxes that contain all integers between 1 and 9999, in such a way that for any N, N, 2N, 3N, and 4N are in four different boxes. If 1,2,3 and 4 are in boxes labelled 1,2,3 and 4, respectively, in [...] [Read more...]

Because it’s Friday: 7 billion-person ‘continents’

October 19, 2012 | David Smith

The population of the world has been over 7 billion for about a year now. But those seven billion aren't distributed equally around the globe. 1.2 billion people — about in India alone (despite it havingjust 2% of the world's land area). At the other end of the spectrum, the entire continent of Australia ... [Read more...]

Company Valuation using Discounted Cash Flows

October 18, 2012 | systematicinvestor

Today I want to show a simple example of how we can value a company using Discounted Cash Flow (DCF) analysis. The idea is to compute the company’s Intrinsic Value based on the discounted future cash-flows. To compute future cash-flows I will use the historical Free Cash Flow growth ... [Read more...]
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