Monthly Archives: August 2014

Introducing pipeR 0.4

August 3, 2014
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pipeR 0.4 is released! Check it out at the project page. In this new version, two things happen. First, %____% handles everything. Second, the introduction of Pipe object. %____% In version 0.4, I decide to merge the functionality of all three operators in the previous versions. Only %____% operator remains, and the two other operators are deprecated. But to make the...

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Men set to live as long as women by 2010?

August 3, 2014
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Men set to live as long as women by 2010?

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 slides are available online http://cass.city.ac.uk/…). I don’t really know U.K. demography,...

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Introducing sanitizers 0.1.0

August 3, 2014
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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...

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enrichment map

August 3, 2014
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enrichment map

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: 423 Words Totally

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Guns are Cool – Differences between states

August 3, 2014
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Guns are Cool – Differences between states

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, % ...

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Welcome to Data Science LA!

August 2, 2014
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Welcome! We are launching DataScience.LA to provide a home for all the content (slides, code,...

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qdap 2.1.1 Released

August 2, 2014
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qdap 2.1.1 Released

We’re very pleased to announce the release of qdap 2.1.1 This is the latest installment of the qdap package available at CRAN. Several important updates have occurred since we last blogged about the 1.3.1 release (demoing Version 1.3.1), most notable: … Continue reading →

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RcppAramdillo & OS X Mavericks configuration

August 2, 2014
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RcppAramdillo & OS X Mavericks configuration

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 →

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Customer Segmentation Using Purchase History: Another Example of Matrix Factorization

August 2, 2014
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Customer Segmentation Using Purchase History: Another Example of Matrix Factorization

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. The brands along with some features and...

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The odds of a cluster of airplane accidents

August 2, 2014
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The odds of a cluster of airplane accidents

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....

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