Monthly Archives: September 2012

Association and concordance measures

September 12, 2012
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Association and concordance measures

Following the course, in order to define assocation measures (from Kruskal (1958)) or concordance measures (from Scarsini (1984)), define a concordance function as follows: let be a random pair with copula , and with copula . Then define the so-...

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Great Circles, Black Holes, and Community Events Part 2 of 3

September 12, 2012
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Great Circles, Black Holes, and Community Events Part 2 of 3

This post will examine the Heber Valley Railroad, a small town tourist attraction using event gravitational pull. Using the information from part 1 the two factors associated with the events gravity, the number of participants, and the distance they traveled. The number of participants can be shown using bar charts, histograms, and summary tables. The distance traveled...

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Let’s go! (and Disclaimer)

September 12, 2012
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Let's get that started ...Fun stuff with R coming soon!Disclaimer beforehand:The analyses I'll present are not meant to be taken too seriously in a scientific way. I just wanna show what you can do with R as a programming language, basic statistics and...

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Review of “Numerical Methods and Optimization in Finance” by Gilli, Maringer and Schumann

September 12, 2012
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Review of “Numerical Methods and Optimization in Finance” by Gilli, Maringer and Schumann

Previously This book and the associated R package were introduced before. Executive Summary A very nice — and enlightening — discussion of a wide range of topics. Principles The Introduction to the book sets out 5 principles.  This is probably the most important part of the book.  The principles are: We don’t know much in … Continue reading...

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How to check your package with R-devel

September 12, 2012
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In response to an update to ggplot2 (now verson 0.9.2) I had to make some minor changes to our package TripleR. The CRAN maintainers also asked to … Please also fix other issues that may be apparent in checks with a current R-devel. Now, how can this be done? Here’s my workflow on Mac OS

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One-Way ANOVA

September 11, 2012
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One-Way ANOVA Analysis of variance is a tool used for a variety of purposes. Applications range from a common one-way ANOVA, to experimental blocking, to more complex nested designs. This first ANOVA example provides the necessary tools to analyze data using this technique. This example will show a basic one-way ANOVA. I will save the

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wordcloud makes words less cloudy

September 11, 2012
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wordcloud makes words less cloudy

  An update to the wordcloud package (2.2) has been released to CRAN. It includes a number of improvements to the basic wordcloud. Notably that you may now pass it text and Corpus objects directly. as in: #install.packages(c("wordcloud","tm"),repos="http://cran.r-project.org") library(wordcloud) library(tm) wordcloud("May our children and our children's children to a thousand generations, continue to enjoy the

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Fund Now or Buy Later? A Kickstarter Price Comparison

September 11, 2012
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Fund Now or Buy Later? A Kickstarter Price Comparison

Hi Internet! I’m Preeya, and I will be your guide in this blog’s quantitative quest for knowledge. To get started, let’s talk about pricing. Part of the Kickstarter process is figuring out how much a hypothetical product will cost once it’s on the market. But how accurately can that be calculated without actually going through … Continue reading...

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Integrate data and reporting on the Web with knitr

September 11, 2012
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Today's guest post comes from Yihui Xie, author of the knitr package — ed. Hi, this is Yihui Xie, and I'm guest posting on the Revolutions blog to talk about one aspect of the knitr package: how we can integrate data analysis and reporting in R with the Web. This post includes both the work that has been done...

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Big data analysis, for free, in R (or “How I learned to load, manipulate, and save data using the ff package”)

September 11, 2012
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Big data analysis, for free, in R (or “How I learned to load, manipulate, and save data using the ff package”)

Before choosing to support the purchase of Statistica at my workplace, I came across the ff package as an option for working with really big datasets (with special attention paid to ff dataframes, or ffdf). It looked like a good … Continue reading →

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