1128 search results for "latex"

Italian Bio R Day 2012 – Slides on Reproducible Research using R and Bioconductor

December 3, 2012
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Italian Bio R Day 2012 – Slides on Reproducible Research using R and Bioconductor

Thanks to Parco Tecnologico Padano (PTP), I was invited to speak at the first Italian Bio R Day that was held in Lodi on 30 November 2012. It was a nice opportunity to talk and listen about different aspects of R from practitioners with different backg...

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forecast package v4.0

December 2, 2012
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forecast package v4.0

A few days ago I released version 4.0 of the forecast package for R. There were quite a few changes and new features, so I thought it deserved a new version number. I keep a list of changes in the Changelog for the package, but I doubt that many people look at it. So for the record, here are...

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Trading with Support Vector Machines (SVM)

November 30, 2012
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Trading with Support Vector Machines (SVM)

Finally all the stars have aligned and I can confidently devote some time for back-testing of new trading systems, and Support Vector Machines (SVM) are the new “toy” which is going to keep me busy for a while. SVMs are a well-known tool from the area of supervised Machine Learning, and they are used both

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Because it’s Friday: Evolution of a research paper about Reddit

November 30, 2012
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Computer Science PhD student Tim Weninger wrote a 10-page paper for the World Wide Web conference looking at how Reddit users interact on the discussion pages of the social news site. During the process, he saved 463 revisions of the paper in a source-code control system. Then, he wrote a computer program to animate each revision of the paper....

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What Time Is It?

November 28, 2012
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What Time Is It?

A common scenario that I run into is time and how to deal with it. I often will do a  variety of summaries and analysis that need to be measured at different points in time. Whether I want to graph the data or review the results I need to be able to perform measurements relative

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Creating PDFs and websites with the "knitr" package

November 27, 2012
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Just a fast note: I came across the R-package "knitr" which enables you to generate PDF files by mixing LaTeX and R code in one document. The result looks very nice and is great to create documentations, manuals and so on. I find knitr much easier to u...

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IPython vs knitr, or Python vs R

November 23, 2012
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IPython vs knitr, or Python vs R

I watched this video by Fernando Pérez a few days ago when I was reading a comment by James Correia Jr on Simply Statistics: This is absolutely a fantastic talk that I recommend everybody to watch (it is good in both the form and content). Not surprisingly, I started thinking ipython vs knitr. Corey Chivers said we could...

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optimising accept-reject

November 20, 2012
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optimising accept-reject

I spotted on R-bloggers a post discussing optimising the efficiency of programming accept-reject algorithms. While it is about SAS programming, and apparently supported by the SAS company, there are two interesting features with this discussion. The first one is about avoiding the dreaded loop in accept-reject algorithms. For instance, taking the case of the truncated-at-one

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Functional programming with lambda.r

November 20, 2012
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Functional programming with lambda.r

After a four month simmer on various back burners and package conflicts, I’m pleased to announce that the successor to …Continue reading »

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The Heteroskedastic Probit Model

November 19, 2012
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The Heteroskedastic Probit Model

Specification testing is an important part of econometric practice. However, from what I can see, few researchers perform heteroskedasticity tests after estimating probit/logit models. This is not a trivial point. Heteroskedasticity in these models can represent a major violation of the probit/logit specification, both of which assume homoskedastic errors. Thankfully, tests for heteroskedasticity in these

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