1115 search results for "Latex"

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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Sunday Data/Statistics Link Roundup (11/18/12)

November 18, 2012
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An interview with Brad Efron about scientific writing. I haven’t watched the whole interview, but I do know that Efron is one of my favorite writers among statisticians. Slidify, another approach for making HTML5 slides directly from R.  I love … Continue reading →

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Simulating Sudden Oak Death Dynamics

November 16, 2012
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Simulating Sudden Oak Death Dynamics

I am working on a project with the Rizzo Lab examining the dynamics of Sudden Oak Death (SOD). I really have to write more about this, but today I’m just going to post the results of an initial exercise. Here I attempt to replicate model results from Cobb et al. (2012). The model in that paper simulates...

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On Box-Cox transform in regression models

November 13, 2012
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On Box-Cox transform in regression models

A few days ago, a former student of mine, David, contacted me about Box-Cox tests in linear models. It made me look more carefully at the test, and I do not understand what is computed, to be honest. Let us start with something simple, like a linea...

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