# Monthly Archives: August 2011

## Bayesian analysis: Comparing algorithms Part 1?

August 22, 2011
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$\frac{\beta^\alpha x^{\alpha-1}e^{-\beta x}}{{\Gamma(\alpha)}}$

I recently had the opportunity to engage in some Bayesian analysis at work. I was able to state the problem in terms of the lognormal distribution, and took advantage of JAGS and its integration with "R" using the R2jags package. The client was very ha...

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## Tenure track position in systematics at the University of Vermont

August 22, 2011
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There is an awesome position opening up for an assistant professor in systematics at the University of Vermont. Below is the announcement, and see the original post at the Distributed Ecology blog. Why is this related to R? One can do a lot of systemat...

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## RTextTools v1.3 Released + Rstem Now Available on CRAN

RTextTools v1.3 was released on August 21, and the package binaries are now available on CRAN. This update fixes a major bug with the stemmers, and it is highly recommended you upgrade to the latest version. Other changes include optimization of existing functions and improvements to the documentation.Additionally, Duncan Temple Lang has graciously

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## SIGKDD 2011 Conference — Day 1 (Graph Mining and David Blei/Topic Models)

August 22, 2011
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I have been waiting for the KDD conference to come to California, and I was ecstatic to see it held in San Diego this year. AdMeld did an awesome job displaying KDD ads on the sites that I visit, sometimes multiple times per page. That’s good targeting! Mining and Learning on Graphs Workshop 2011 I had originally planned to attend the...

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## R Code for Bow Tie Plots

August 22, 2011
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Earlier, I discussed the nice properties of bow tie plots for visualizing and understanding inferences from simple randomized treatment experimental designs. R code to quickly create these plots is available here. You can use the command source("htt...

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## Last and final on Richter’s painting

August 22, 2011
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$Last and final on Richter’s painting$

For a quick recap, Pierre and I supervised a team project at Ensae last year, on a statistical critique of the abstract painting 1024 Colours by painter Gerhard Richter. The four students, Clémence Bonniot, Anne Degrave, Guillaume Roussellet and Astrid Tricaud, did an outstanding job. Here is a selection of graphs and results they produced.

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## Recession forecasting II: Assessing Hussman’s Accuracy

August 22, 2011
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In my last post on recessions, I implemented John Hussman's Recession Warning Composite in R. In this post I will examine how well this index performs and discuss how we might improve it. If you would like to follow along at home, be sure to run the ...

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## More useless statistics

August 22, 2011
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Over at the ExploringDataBlog, Ron Pearson just wrote a post about the cases when means are useless. In fact, it’s possible to calculate a whole load of stats on your data and still not really understand it. The canonical dataset for demonstrating this (spoiler alert: if you are doing an intro to stats course, you

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## A view of useR!2011

August 22, 2011
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Start Brian Ripley The conference was opened with a talk by Brian Ripley.  I’ll distort his talk into 3 points that came across to me. 1. R Core is finite The time available from R Core members is a strictly limited good.  The more that is pushed onto R Core, the less attention to details.  … Continue reading...

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## Introduction to Latent Dirichlet Allocation

August 21, 2011
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Introduction Suppose you have the following set of sentences: I like to eat broccoli and bananas. I ate a banana and spinach smoothie for breakfast. Chinchillas and kittens are cute. My sister adopted a kitten yesterday. Look at this cute hamster munching on a piece of broccoli. What is latent Dirichlet allocation?...

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