Thanks to a posting on R-sig-eco mailing list I learned of the IUCN-API. Here's a simple example for what can be done with it (output as pdf is HERE):require(XML)require(maptools)require(jpeg)input = "panthera-uncia"h [Read more...]

R''s glm function for generalized linear modeling is very powerful and flexible: it supports all of the standard model types (binomial/logistic, Gamma, Poisson, etc.) and in fact you can fit any distribution in the exponential family (with the family argument). But if you want to use it on a ... [Read more...]

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This is probably an issue that has been addressed by many blog posts (including these ones: [link1] and [link2]), and can be deduced from R Installation and Administration manual. However, I will post it here for future reference. The problem is that w... [Read more...]

I've not added tips for a while. Here is it for today:1. How to add title for graph with multiple plots?par(mfrow=c(1,2),oma = c(0, 0, 2, 0))plot(1:10,  main="Plot 1")plot(1:100,  main="Plot 2")mtext("Title for Two Plots", outer = TRUE, cex =... [Read more...]

A couple of days ago, I started to think about SAP HANA and R on Amazon Web Services...as far as I know, graphics can't get generated using this kind of integration because the graphic will get generated on the server and could not make the trip back i... [Read more...]

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By now you've probably heard about the fact that Orbitz users accessing the site via Macs are seeing more expensive hotel options when they search. But it seems worth clearing up a couple of fallacies. First, it's not as if the same hotel room is being offered at a higher ... [Read more...]

Still gettin' it? I'm off to Montreal for Jazzfest. [Read more...]

PluginR has been updated in mods.tiki.org. So what? Do I need to update my PluginR? How can I do it? PluginR resides in a subversion (svn) repository in sourceforge.net. Files can be fetched at any time by anyone using svn (see details in http://de... [Read more...]

This article gives a brief overview of the data.table package written by M. Dowle, T. Short, S. Lianoglou. A data.table is an extension of a data.frame created to reduce the working time of the user in two ways programming time … Continue reading → [Read more...]

When talking about confidence intervals, Jacob Cohen famously said: “I suspect that the main reason they are not reported is that they are so embarrassingly large!” (Cohen, 1994). In this post I'll take a look at the relationship between the 95 % CI for Cohen's d and it's corresponding sample size. [Read more...]

Introduction I've been incredibly busy the last month, amongst other things I've moved about 400 miles from Umeå, in the north of sweden, to Stockholm. However, I've been working a lot with R and especially with power analysis both via Monte Carlo simulations and via analytical approaches. I will not write ... [Read more...]

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I want to continue with Factor Attribution theme that I presented in the Factor Attribution post. I have re-organized the code logic into the following 4 functions: factor.rolling.regression – Factor Attribution over given rolling window factor.rolling.regression.detail.plot – detail time-series plot and histogram for each factor factor.rolling.... [Read more...]

While the US's Major League Soccer is using advanced analytics to analyze ball movement and improve team composition, they might want to think about a smaller, but possibly more impactful, goal for analytics. Like, how to explain to an American audience what a 1-2 game means to a basketball or ... [Read more...]

In Part I of this series I described how to set up your tumblr blog so that you can create posts like those on the example site R Markdown Blog. Now I’ll describe how you can actually create such posts. I’ll be using the RStudio IDE for the ... [Read more...]

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When I am working in new institutions and I am asking: “Do you have a document management system?” I often get the answer:”Yap, we are using folders” … OKAY. Making analysis, developing applications and keeping an eye on code, data and applications make this even harder as it has to ... [Read more...]