# Monthly Archives: November 2012

## "Sample Sets" plots (Shootout-2012)

November 11, 2012
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Histograms of all the sample sets together and individuallyRaw SpectraSpectra treated with MSC (Multiple Scatter correction)Spectra treated with SG filters﻿

## How I cracked Troyis (the online flash game)

November 11, 2012
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Troyis™ is an addictive online flash game where you move a chess knight through increasingly difficult puzzles. After hours and hours of playing, sometimes late into the night, I decided I'd waste even more of my time and write a little program tha...

## A thermometer in R using Arduino and Java

November 11, 2012
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A couple of weeks ago, Markus Gesmann demonstrated the feasability of connecting R and Arduino using Processing and Rserve in a nice and simple example. This actually rekindled my interest in Arduino that I hadn’t had time to satisfy… Again I will show a very easy and simple example, but this time, transferring the data between Arduino and R...

## How John Deere uses R

November 10, 2012
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HT: Revolution Analytics  Very good discussion about real applied econometrics and analytics including the use of ARIMA models, decision trees, and genetic algorithms. He also has a very smart approach in his attitude toward big data and data s...

## Temporal networks with igraph and R (with 20 lines of code!)

November 10, 2012
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In my last post about how a twitter conversation unfolds in time on Twitter, the dynamical nature of information diffusion in twitter was illustrated with a video of the temporal network of interactions (RTs) between accounts. The temporal evolution of … Continue reading →   Related posts: Temporal network of information diffusion...

## R Tips for Quantitative Trading

November 10, 2012
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The article below is an updated version of an article I wrote  for R-Bloggers in August 2010. As a first post I thought it was a good idea to introduce one of the best tool out there for quantitative  trading: R R is a free software environment for statistical computing and graphics. It compiles and

## Secret Santa

November 10, 2012
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On reddit somebody asked For n individuals, what's the probability that the last person to pick during a round of Secret Santa name picking, will pick their own name.. "With each person picking in turn, and re-picking if they pick out th...

## Back-testing Rules

November 10, 2012
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Nowadays there are many trading strategies shared online with reproducible, decent, results. Have you asked yourself, if the strategies are so profitable, why the author bother even sharing them, when the path to riches is clear – just implement the strategy and use it? There are people, of course, who are fascinated and challenged by

## Using R — .Call(“hello”)

November 9, 2012
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This entry is part 10 of 12 in the series Using RIn an introductory post on R APIs to C code, Calling C Code ‘Hello World!’, we explored the .C() function with some ‘Hello World!’ baby steps.  In this post …   read more ...

## Did the sun just explode? The last Dutch Book you’ll ever make

November 9, 2012
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$Did the sun just explode? The last Dutch Book you’ll ever make$

In today’s XKCD, a pair of (presumably) physicists are told by their neutrino detector that the sun has gone nova. Problem is, the machine rolls two dice and if they both come up six it lies, otherwise it tells the truth. The Frequentist reasons that the probability of obtaining this result if the sun had