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Yesterday I was reading Kontopantelis & Reeves’s 2010 paper “Performance of statistical methods for meta-analysis when true study effects are non-normally distributed: A simulation study“, which compares fixed-effects and a variety of random effects models under the (entirely realistic) situation … Continue reading → [Read more...]

We're delighted to announce that we have received additional funding from the Sloan Foundation to continue and expand our efforts from the past year. We're grateful for the overwhelming support from the community, especially through engagement at various events we organized and attended this past year. Over the next year ... [Read more...]

A few weeks ago I was invited to a meeting where a group was interested in exploring options for replacing their contract with a propriety software. They invited me because they saw some resemblances between a Shiny application I made and the features ... [Read more...]

The example I present here is a little silly, yet it illustrates how to join tables with data.table in R. Mapping old data to new dataCategories in general are never fixed, they always change at some point. And then the trouble starts with the data. For example not that ... [Read more...]

RcppRedis, another new package of mine, appeared on CRAN a few weeks ago just in time for our annual R/Finance conference. And as of today, we also have Windows binaries thanks to generous help from John Buonagurio who help building the required 32-... [Read more...]

In case you missed them, here are some articles from May of particular interest to R users: Karl Broman's hipsteR guide lists some new(ish) features of R that early adopters may have missed. Joseph Rickert reviews the R/Finance 2014 conference and summarizes the R packages presented there. Plus, a ... [Read more...]

In Part 1 we looked at acquiring raw data, and wrangling it into a time series dataset. In Part 2 we looked at types of threats in the time series. In Part 3 we looked at countries. Now we will examine countries and types in combination in the AlienVault reputation database. Just as ... [Read more...]

As you all know, the decimal mark is a symbol used to separate the integer part from the fractional part of a number written in decimal form. Since I am born and raised in Continental Europe I am quite found of using the comma sign to indicate a decimal point. ... [Read more...]

Science is reportedly in the middle of a reproducibility crisis. Reproducibility seems laudable and is frequently called for (e.g., nature and science). In general the argument is that research that can be independently reproduced is more reliable than research that cannot be independently reproduced. It is also worth noting ... [Read more...]

A new minor release 0.11.2 of Rcpp is now on the CRAN network for GNU R, and binaries for Debian have also been uploaded. The release smoothes a few edges on both the Rcpp side itself, as well as on the interaction between Rcpp and R which since... [Read more...]

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While the NBA finals are in full swing and the two best teams are battling it out for the ultimate prize, another 28 are now in summer vacation. In order to achieve their goal of still playing this time next year, teams often look to improve their roster through trades, player ... [Read more...]

Jesse, you asked me if I was in the meth business or the money business. Neither. I’m in the empire business (Walter White in Breaking Bad) The game of pig has simple rules but complex strategies. It was described for the first time in 1945  by a magician called John ... [Read more...]

Introduction Quite often I write which(...)[1] to find the first element of a vector matching some condition. One has to wonder whether that’s wasteful, though, since there is no need to do any tests once one works. I decided to try using C++, using Rcpp, to see if speed ... [Read more...]

Introduction I got interested in layered sedimentation from viewing a video and decided it would be interesting to code this into R. More on that in due course, but my first step was to code a syatem with one sediment “type”. Procedure The following code drops sediment particles at x=1, ... [Read more...]

[This article was first published on Rmetrics blogs, and kindly contributed to R-bloggers]. (You can report issue about the content on this page here) Want to share your [Read more...]

[    ] Under the impulsion of @kevin_ushey who already did something similar for Rcpp, we've been adding subsetting behavior into Rcpp11. The idea is given a vector y and a vector x we want to give meaning to y[x]. The first legitimate question is what kind of x do we ... [Read more...]

This is the first of a two-part series. Part 1 sets up the story and goes into how to discover, digest & reformat the necessary data. Part 2 will show how to perform some basic visualizations and then how to build beautiful & informative density maps from the data and offer some suggestions as ... [Read more...]

I find population pyramids to be very effective teaching tools. In short, a population pyramid is a type of chart that shows the population size of different age cohorts on the x-axis, with gender usually displayed back-to-back to create the shape of a “pyramid.” It is used to illustrate a ... [Read more...]