April 18, 2013 - 18:00 - 21:00 Fiori Oscuri Bistrot & Bar (www.fiorioscuri.it) Via Fiori Oscuri, 3 - Milano (Zona Brera) 18.00 - 18.15 Registration 18.15 - 18.30 Welcome presentation Andrea Spanò, Partner at Quantide 18.30 - 19.00 Digit recognition Machine … Continue reading → [Read more...]

The registration for the first R in Insurance is open and there is still time to submit a talk / lightning talk.The conference will take place at Cass Business School in London on Monday, 15 July 2013. This is the Monday following the useR! 2013 confer... [Read more...]

I raise this question because we see calls for running segmentation with individual estimates from hierarchical Bayes choice models without any mention of the possible complications that might accompany such an approach.  Actually, all the calls seem to be from those using MaxDiff to analyze the data from incomplete block ... [Read more...]

The problem: producing a Word (.docx) file of a statistical report created in R, with as little overhead as possible. The solution: combining R+knitr+rmarkdown+pander+pandoc (it is easier than it is spelled). If you get what this post is about, just …Read more » [Read more...]

Sometimes one needs to read tables that are a bit messy, so that read.table doesn’t immediately recognize the content as numerical. Maybe some weird characters are sprinkled in the table (ever been given a table with significance stars in otherwise numerical columns?). Some search and replace is needed. ... [Read more...]

I created a simple jquery plugin to display some information when hovering links to r documentation files hosted at help.r-enthusiasts.com Below is a snapshot from highlight.r-enthusiasts.com that uses the tooltips: See also a live example here: data.frame Using this feature … Continue reading → [Read more...]

Can't remember where I first came across this equation but the Tupper's self referential equation, is a very interesting formula that when graphed in two dimension plane it reproduces the formula. \[ \frac{1}{2} I first thought this would be a quick 5 min exercise which turned into a 3 hour work, the obstacle ... [Read more...]

It really is trivial. Not every proportion is frequency. There are things that have values  bounded between 0 and 1 and yet they are neither probabilities, nor frequencies. Why do I even bother to write this? Because some kinds of…Read more → [Read more...]

Rcpp 0.10.3 is on CRAN. Here is the part of the NEWS file related to this release Changes in R code Prevent build failures on Windowsn when Rcpp is installed in a library path with spaces (transform paths in the … Continue reading → [Read more...]

This blog is moving to blog.r-enthusiasts.com. The new one is powered by wordpress and gets a subdomain of r-enthusiasts.com. See you there [Read more...]

highlight uses simple jquery command to syntax highlight R code contained in any regular element. For example, this chunk of code, from the datasets::cars help file. require(stats); require(graphics) plot(cars, xlab = "Speed (mph)", ylab = "Stopping distance (ft)", las … Continue reading → [Read more...]

In the original ARMA/GARCH post I outlined the implementation of the garchSearch function. There have been a few requests for the code so … here it is. Quite easy to use too: After the last code line above, fit contains the best (according to the AIC statistic) model, which is ... [Read more...]

This blog post uses a function and a script written in R that were displayed in an earlier blog post. Introduction This is the second of a series of blog posts about simple linear regression; the first was written recently on some conceptual nuances and subtleties about this model.  In ... [Read more...]

Here is the function that I wrote for doing simple linear regression, as alluded to in my blog post about simple linear regression on log-transformed data on the decay of DDT concentration in trout in Lake Michigan.  My goal was to replicate the 4 columns of the output from applying summary() ... [Read more...]

When text data is in a nice CSV format, read.csv is enough to parse it into a useable format. But if this is not the case, getting the data into a useable format is not so straightforward. In this post… See more › [Read more...]

As requested here's the packed data and a test bench you can test your own merging function ideas and replicate my results (hopefully). If you want the plots you can use the end part of scripts in part1 part2. The data is a bunch of super secret Eve... [Read more...]

There may be no R topic that is more controversial than the humble for-loop. And, to top it off, good help is hard to find. I was astounded by the lack of useful posts when I googled “for loops in R” (the top return linked to a page that did ... [Read more...]

We had a great turnout yesterday for our Zero to R Hero workshop at the Quebec Centre for Biodiversity Science. We went from the absolute basics of the command line, to the intricacies of importing data, and finally we had a look at plotting using ggplot2. We didn’t have ... [Read more...]

It was great to have a little break, Spring break, although the weather didn’t feel like spring at all! During the early part of the break I worked on my final project for Jeff Leek’s data analysis class, which we call 140.753 here. Continuing my previous posts on the ... [Read more...]

Sometimes I actually use my experiments for real work.  For example, I wanted to send an update  on the Japanese Yen.  This was a great opportunity to use the chart created in Shading and Points with xtsExtra plot.xts.I was fairly please... [Read more...]