A few months ago, in Men set to live as long as women, figures show, it was mentioned that (in the U.K.) the gap between male and female life expectancy is closing and men could catch up by 2030, according to an adviser for the Office for National Statistics. (the ... [Read more...]

A new package sanitizers is now on CRAN. It provides test cases for Address Sanitizers, and Undefined Behaviour Sanitizers. These are two recent features of both g++ and clang++, and described in the Checking Memory Access section of the Writing R Ex... [Read more...]

In PLOB's QQ group, someone asked how to change the color of enrichment map in Cytoscape. I am very curious how enrichment map can helps to interpret enrichment results. It took me 2 hours to implement it using R and I am surprised that the enrichment map is better than anticipated. ... [Read more...]

Last week my blog showed that there are differences between states in the shootingtracker database. This week it is attempted to understand why states are different. A number of variables were extracted from a few sources, among which gun laws, % ... [Read more...]

Welcome! We are launching DataScience.LA to provide a home for all the content (slides, code,... [Read more...]

[Read more...]

I am in the process of speeding up some code, and I have been lured by the promises of Rcpp. Since the functions I am working on are mainly linear algebra, I wanted to try out RcppArmadillo. This put my … Continue reading → [Read more...]

As promised in my last post, I am following up with another example of how to perform market segmentations with nonnegative matrix factorization. Included with the R package bayesm is a dataset called Scotch containing the purchase history for 21 brands of whiskey over a one year time period from 2218 respondents. ... [Read more...]

Recently, there have been a lot of airplane accidents. July, 17th 2014, Hrabove, Ukraine, Malaysia Airlines, Boeing 777, fatalities 298 (/298) July, 23rd 2014, Magong, Taiwan, TransAsia Airways, ATR 72-500, fatalities 47 (/58) July, 24th 2014, Aguelhok, Mali, Air Algerie, Mc Donnell Douglas MD-83, fatalities 116 (/116) It is simple to find a lot of datasets about airplane crashes. For ... [Read more...]

I’ve been working on an R package, R/qtlcharts, with D3-based interactive graphs for quantitative trait locus mapping experiments. Testing the interactive charts it produces is a bit of a pain. It seems like I pretty much have to just open a series of examples in a web ... [Read more...]

Last week a reader of the r-help mailing list posted a query titled “Importing random subsets of a data file.”  With a very large file, it is often much easier and faster–and really, just as good–to just work with a much smaller subset of the data. Fellow readers ... [Read more...]

I  was looking for some Game-Theory post in R-bloggers and found this very cool post,  obviously I decided to read the post, to look at the code and implement a version of it.The idea of the post was very cool for me that I thought it would b... [Read more...]

Many thanks to everyone who attended Tuesday's webinar, Applications in R - Success and Lessons Learned from the Marketplace. We had a great turnout and a very lively Q&A session. I've already shared many of the slides describing how companies like Google, Facebook and the New York Times use ... [Read more...]

Here is a new visualization done in d3js. In this visualization I show a scatter plot of two variables with a given correlation. The variables are samples from the standard normal distribution, which are then transformed to have a given correlation by... [Read more...]