Trying to dimly recall things from my maths degree, it seems that in most contexts the whole point of the number one is that it is a multiplicative identity. That is, for any x in your set, 1 * x is equal to x. It turns out that when you move to ... [Read more...]

Well, I'm taking the plunge and learning Python. We'll see how this goes. Then I'll try NumPy (and SciPy, if it gets ported), and see of I can get R and Python talking. [Read more...]

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Get access to a simple object browser in R so that you can see what variables, data frames, model objects and other junk you have in memory currently. If you don't want to install a full-fledged integrated development environment, this option may be fo... [Read more...]

Easiest way to start imagining four-dimensional things is by numbering the corners of a 4-cube. First realize that the eight corners of a cube can be numbered “in binary” 000—001–010–100—110–101–011—111. Just like the four corners of ... [Read more...]

Sometimes you will need  to add some points to an existing barplot. You might try but you will get a funky looking line/points. It’s a bit squeezed. This happens because bars are not drawn at intervals 1:10, but rather on something else. This “else” can be seen if you ... [Read more...]

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Today I decided to begin more with visualizations and less with basic statistical analysis for sabermetrics using R. I'm not really here to teach the ins and outs of regressions and statistical tests, so once I get there, I'm hoping that those who have read this already have a decent ... [Read more...]

A brief review of Zuur et al.'s book "Mixed Effects Models and Extensions in Ecology with R". [Read more...]

We're very excited to host a new webinar from some of the leading researchers in portfolio design: Diethelm Würtz and Mahendra Mehta for the Rmetrics Association. This webinar will give an overview on current and recent developments and tools for portfolio design, optimization and stability analysis with the R/... [Read more...]

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During the process of molecular systematic research, specimens are given code names and numbers to keep track of data through the pipeline. These can contain a lot of information of relevance to the researcher, but unfortunately are meaningless to others who aren't as involved with the data. On publication, it ... [Read more...]

I should have probably figured this out a long time ago, but as I get deeper into programming with R, I am finding the need to remove all rows from a dataframe.  I was making this alot harder than it had to be. your.df [Read more...]

Yesterday was the one-year anniversary of the Haiti earthquake, and to put the scale of the event in context San Francisco bureau chief for New Scientist magazine and data journalist Peter Aldhous created a time-lapse animation of all large earthquakes in the last year, beginning with the 7.0-magnitude Haiti event. ... [Read more...]

I've refined the R code to pick the best fantasy soccer team by using more granular player performance data (available publicly). Here are the best overall, home and away teams. The constraints used are: 1) Number of goalkeepers = 12) Nu... [Read more...]

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