# Monthly Archives: April 2013

## Subtraction Is Crazy

April 4, 2013
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$\large \dpi{200} \bg_white f ^\prime \equiv \lim_{\mathrm{lag} \downarrow 0} {\mathrm{lag} (f)-f \over |\mathrm{lag}| }$

I was re-reading Michael Murray’s explanation of cointegration: and marvelling at the calculus. Calculus blows my mind sometimes. Like, hey guess how much we can do with subtraction. — protëa(@isomorphisms) March 28, 2013 Of course it’s not any subtraction. It’s subtracting a function from a shifted version of itself. Still doesn’t sound like a universal revolution. (But of course the...

## R, D3js and SNA Course

April 4, 2013
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Update 2015-11-09: This is migration from an old post. I took the SNA course by Lada Adamic in coursera. It’s a super interesting course. In fact, I was using the networks only how a visualization tool, and that is what it make me little bit embarrassing because there are more, a lot of more. You can detect communities,...

## Tutorial- Building Biological Networks

April 4, 2013
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I love networks! Nothing is better for visualizing complex multivariate relationships be it social, virtual or biological. I recently gave a hands-on network building tutorial using R and Cytoscape to build large biological networks. In these networks Nodes represent metabolites and edges can be many things, but I specifically focused on biochemical relationships and chemical

## Demographic analysis using the `popbio` library and some other fun stuff

April 4, 2013
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This week at the Davis R Users’ Group we had a great presentation by Kara Moore O’Leary on using the popbio package to examine rare plant demographics. The following is her script run through knitr. You can download the original script and associated data here. Find out more about Kara and her work at...

## R 3.0 released; ggplot2 stat_summary bug fixed!

April 4, 2013
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The new version of R was released yesterday. As I understand it, the numbering change to 3.0 represents the recognition that R had evolved enough to justify a new number rather than the addition of many new features. There are some important new featur...

## An Introduction to SAS for R Programmers

April 4, 2013
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by Joseph Rickert Life decisions are usually much too complicated to be attributed to any single cause, but one important reason that I am here at Revolution today is that I ignored suggestions from well-meaning faculty back in graduate school to work more in SAS rather than doing everything in R. There was a heavy emphasis on SAS then:...

## List of Bioinformatics Workshops and Training Resources

April 4, 2013
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I frequently get asked to recommend workshops or online learning resources for bioinformatics, genomics, statistics, and programming. I compiled a list of both online learning resources and in-person workshops (preferentially highlighting those where workshop materials are freely available online):List of Bioinformatics Workshops and Training ResourcesI hope to keep the page above as up-to-date as possible....

## Test from knitr to wordpress

April 4, 2013
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Title This is an R Markdown document. Markdown is a simple formatting syntax for authoring web pages (click the MD toolbar button for help on Markdown). When you click the Knit HTML button a web page will be generated that includes both content as well as the output of any embedded R code chunks within

## Measuring the Intensity of Historical Crises with VaR (Part 2)

April 4, 2013
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Adam Duncan, December 2012Also avilable on R-bloggers.com If you missed the first part of this analysis, be sure to check it out on gtog.github.com.In this part of the analyis, I’m going to look at the actual 1 day negative returns / VaR estimates (“VaR breaks”) across a numnber of different asset classes. The hope is to arrive at...

## Construct an unique index from two integer (Pairing Function)

April 3, 2013
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Recently, I need to construct an unique index from two integer. The best solution I found is the Pairing function. Pairing function is an one to one and onto function that map two integers to a single integer. The definition as follows: If ordering of x and y is not important, we can swap x