Monthly Archives: January 2011

Slides and replay for "Portfolio design, optimization and stability analysis"

January 27, 2011
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Slides and replay for "Portfolio design, optimization and stability analysis"

Thanks to everyone who attended yesterday's webinar, "Portfolio design, optimization and stability analysis", presented by Diethelm Würtz of the Rmetrics Association and sponsored by Revolution Analytics, Sybase, Finance Online and NeuralTechSoft. (And thanks in particular for your patience for the last start -- in a perfect demonstration of Murphy's law a microphone failed moments before the scheduled start.) If...

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Building a Better Word Cloud

January 27, 2011
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Building a Better Word Cloud

A few weeks ago I attended the NYC Data Visualization and Infographics meetup, which included a talk by Junk Charts blogger Kaiser Fung. Given the topic of his blog, I was a bit shocked that the central theme of his talk was comparing good and bad word clouds. He even stated that the

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How to label all the outliers in a boxplot

January 27, 2011
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How to label all the outliers in a boxplot

In this post I offer an alternative function for boxplot, which will enable you to label outlier observations while handling complex uses of boxplot.

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ZurichR and GenevaR – two new R user groups

January 27, 2011
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Details of the inaugural ZurichR and GenevaR meetings are as follows:

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Speed up your R code

January 26, 2011
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Speed up your R code

This short post is to share an R tip Pierre recently gave me. When you need to store values sequentially (typically inside a loop), it’s more far efficient to create the whole vector (or matrix) and to fill it, rather than to concatenate the values to your current vector (or matrix). In terms of allocation

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ABC model choice not to be trusted

January 26, 2011
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ABC model choice not to be trusted

This may sound like a paradoxical title given my recent production in this area of ABC approximations, especially after the disputes with Alan Templeton, but I have come to the conclusion that ABC approximations to the Bayes factor are not to be trusted. When working one afternoon in Park City with Jean-Michel and Natesh Pillai

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New R User Group in Minneapolis/St. Paul

January 26, 2011
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The Twin Cities R User Group has been around for a little while, but has just launched a new site at meetup.com. Their next meeting will be on February 16, where Erik Iverson will be giving a talk on using R to generate dynamic statistical reports using R's literate programming tool, Sweave. If you're in the Minneapolis-St.Paul area, this...

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Post-estimation results manipulation: Stata vs. R

January 26, 2011
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Stata's new "margins" command is as powerful as "Zelig" package for R for the purpose of conducting post-estimation manipulation of the results (e.g. producing predicted probabilities, confidence intervals, etc.). While "margins" uses delta method, "Ze...

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Zurich, March 9, 2011 – Rmetrics Presentation at ZurichR User Group

January 25, 2011
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(This article was first published on Rmetrics blogs, and kindly contributed to R-bloggers) To leave a comment for the author, please follow the link and comment on their blog: Rmetrics blogs. R-bloggers.com offers daily e-mail updates about R news and tutorials on topics such as: Data science, Big Data, R jobs, visualization (ggplot2, Boxplots, maps, animation), programming (RStudio, Sweave,...

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A new sponsorship program for local R user groups

January 25, 2011
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Over the past year, Revolution Analytics has sponsored a number of local R user groups, and we've been thrilled to see the enthusiasm with which R users are coming together. This year, we decided to expand and formalize our sponsorship program, so that any local R user group, whether just starting up or already established, can benefit from additional...

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Sponsors

Mango solutions



RStudio homepage



Zero Inflated Models and Generalized Linear Mixed Models with R

Quantide: statistical consulting and training

datasociety

http://www.eoda.de





ODSC

ODSC

CRC R books series





Six Sigma Online Training









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