# Monthly Archives: November 2012

## 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

## Exploring GAMs with Rosemary Hartman

November 9, 2012
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Today at Davis R Users’ Group, Rosemary Hartman took us through her work in progress fitting general additive models to organism presence/absence data. Below is her presentation and script. You can get the original script and data here Also, check the comments below for some discussion of other options for this type of analysis, such as...

## Video: How John Deere uses R

November 9, 2012
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Farming equipment manufacturer John Deere uses R, and in yesterday's webinar their manager of forecast analytics, Derek Hoffman, explained what they use it for: In the presentation, Derek gave a spirited argument of why R is critical for John Deere's operations: from forecasting demand for equipment, to forecasting crop yields (they produce forecasts for more than half the world's...

## Consuming R from SAP Mobile Platform

November 9, 2012
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Early this year, in March, I was visiting my team mates in SAP Labs Palo Alto, and my good friend a team mate Rui Nogueira asked to participate in his most excellent Technology Innovation Podcast show where we spoke about R and SAP HANA. By the end of ...