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When you apply machine learning algorithms on a regular basis, on a wide variety of data sets, you find that certain data issues come up again and again: Missing values (NA or blanks) Problematic numerical values (Inf, NaN, sentinel values like 999999999 or -1) Valid categorical levels that don’t appear ... [Read more...]

(This post is rewritten to adapt to the latest release of pipeR) Pipeline is receiving increasing attention in R community these days. It is hard to tell when it begins but more people start to use it since the easy-and-fast dplyr package imports the magic operator %__% from magrittr, the pioneer ... [Read more...]

This is a follow up on my previous post “A Simple Shiny App for Monitoring Trading Strategies“.  I added a few improvements that make the app a bit better (at least for me!). Below is the list of new features : A sample  .csv file (the one that contains the raw ... [Read more...]

by Joseph Rickert Last week, I posted a list of sessions at the Joint Statistical Meetings related to R. As it turned out, that list was only the tip of the iceberg. In some areas of statistics, such as graphics, simulation and computational statistics the use of R is so ... [Read more...]

Rcpp reached a nice round milestone yesterday: 250 packages on CRAN now depend on it (as measured by Depends, Imports and LinkingTo declarations). The graph is on the left depi... [Read more...]

Recently, there are some comments said that sometimes clusterProfiler failed in KEGG enrichment analysis. kaji331 compared cluserProfiler with GeneAnswers and found that clusterProfiler gives larger p values. The result forces me to test it. Read More: 251 Words Totally [Read more...]

At useR! 2014, John Chambers was generous enough to provide us with insight into the... [Read more...]

I’ve had a lifelong fascination with maps, and working with R definitely enables my map... [Read more...]

Below is the first of several exciting data science developments for the younger generation, happening... [Read more...]

Here is a quiz on magrittr and you may check if you are really good at using it. Since the CRAN version currently does not support nested ., it won't be interesting to make a quiz on that version. All the following examples are using the latest development version on GitHub. ... [Read more...]

Almost 3 years ago, I wrote about how to forkbomb with R. A quick recap is that a forkbomb is a low-tier, malicious misuse of a system; sort of a "baby's first denial of service". The idea is that you write a program that will start an entirely new copy of ... [Read more...]

In case you missed them, here are some articles from June of particular interest to R users: The deadline for our contest to visualize the location of R user groups has been extended to August 16. Previews of R-related sessions at this year's JSM conference in Boston. Coding errors in R ... [Read more...]

I've set out to produce monthly forecasts of monthly car sales by brand in the US. So far I've made a SUTSE dynamic linear model (code on Github) and created a Shiny app (http://sweiss.shinyapps.io/carvis/) as a prototype (no predictions... [Read more...]

We're delighted to be sponsoring the upcoming Open Science Codefest in Santa Barbara, California, alongside RENCI, NCEAS, NSF, DataONE, and Mozilla Science Lab. The Open Science Codefest's goal is to gather researchers from across ecology, biodiversity science, and other earth and environmental sciences with programmer types to collaborate on coding ... [Read more...]

 First of all, let me say “Thank You” to all of the 357 people who completed the survey. I was hoping for 100, so needless to say the response blew away my expectations. This endeavor seems like a worthwhile effort to do once a year. Next year I will refine the questionnaire ... [Read more...]

In my JSM talk this morning, I spoke about work done by Yingkang Xie and myself, on a novel approach to the parallel coordinates method of visualization.  I’ve made several posts to this blog in the past on freqparcoord, our implemention of our method. My talk this morning used ... [Read more...]

rlist 0.3 is released! This package now provides a wide range of functions for dealing with list objects. It can be especially useful when they are used to store non-tabular data. Two notable features are added in this version. First, list.search and equal() are added in support of fuzzy filtering ... [Read more...]

Let’s start by making one thing clear. Using coloured cells in Excel to encode different categories of data is wrong. Next time colleagues explain excitedly how “green equals normal and red = tumour”, you must explain that (1) they have sinned and (2) what they meant to do was add a column ... [Read more...]

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