Monthly Archives: February 2014

caret webinar materials

February 28, 2014
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The webinar was recorded (thanks to Ray DiGiacomo and the Orange County RUG). The slides are here minus a few typos. 

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Using CART for Stock Market Forecasting

February 28, 2014
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Using CART for Stock Market Forecasting

There is an enormous body of literature both academic and empirical about market forecasting. Most of the time it mixes two market features: Magnitude and Direction. In this article I want to focus on identifying the market direction only. The goal I set myself, is to identify market conditions when the odds are significantly biased

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Who knows the Oscar winners? The betting markets, probably.

February 28, 2014
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Who knows the Oscar winners? The betting markets, probably.

This is the time of year when everyone likes to speculate on the winners of the Academy Awards, to be announced on Sunday. There are plenty of ways to try and predict which movie is going to win Best Picture or who'll win Best Actress. You could look at the various betting markets and see who the speculators are...

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Simply creating various scatter plots with ggplot #rstats

February 28, 2014
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Simply creating various scatter plots with ggplot #rstats

Inspired by these two postings, I thought about including a function in my package for simply creating scatter plots. In my package, there’s a function called sjp.scatter for creating scatter plots. To reproduce these examples, first load the package and then attach the sample data set: The simplest function call is by just providing two

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“Statistical Models with R” Course – Milano, October 24-25, 2013

February 28, 2014
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“Statistical Models with R” Course – Milano, October 24-25, 2013

"Statistical Models with R" CourseMarch 27 and 28, 2014 Course description This two-day course shows a wide variety of statistical models with R ranging from Linear Models (LM) to Generalized Linear Models (GLM) modelling, in order to provide a broad … Continue reading →

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“A short introduction to R” Course – Milano, March 26, 2014

February 28, 2014
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“A short introduction to R” Course – Milano, March 26, 2014

"A short introduction to R" Course March 26, 2014 Course description This one-day course aims to provide an overview of the basic R environment and its applications. This course is intended as a starting point for any future development with … Continue reading →

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Useful Functions in R for Manipulating Text Data

Useful Functions in R for Manipulating Text Data

Introduction In my current job, I study HIV at the genetic and biochemical levels.  Thus, I often work with data involving the sequences of nucleotides or amino acids of various patient samples of HIV, and this type of work involves a lot of manipulating text.  (Strictly speaking, I analyze sequences of nucleotides from DNA that are reverse-transcribed from

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A minor update to my “apply functions” post

February 27, 2014
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A minor update to my “apply functions” post

One of my more popular posts is A brief introduction to “apply” in R. Come August, it will be four years old. Technology moves on, old blog posts do not. So: thanks to BioStar user zx8754 for pointing me to this Stack Overflow post, in which someone complains that the code in the post does

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Foundations of Statistical Algorithms [book review]

February 27, 2014
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Foundations of Statistical Algorithms [book review]

There is computational statistics and there is statistical computing. And then there is statistical algorithmic. Not the same thing, by far. This 2014 book by Weihs, Mersman and Ligges, from TU Dortmund, the later being also a member of the R Core team, stands at one end of this wide spectrum of techniques required by

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R User Groups Update

February 27, 2014
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R User Groups Update

by Joseph Rickert After an end-of-year slow down in R user group acrtivity that lasted into mid January, the Revolution Analytics’ Community Calendar indicates that R user groups worldwide are back in full swing with 48 events listed in the short month of February. And, while the total number of active user groups has not grown from this time...

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