Nicole has been having a lot of fun the last few days creating her own Shiny apps. We work in the same space, and let’s just say her enthusiasm is very contagious. While

Early this week, Google announced its Cloud Vision API, which can detect the content of an image. With the power of R and MXNet, you can try something very similar on your own laptop: an image classification shiny app. Thanks to the powerful shiny framework, it is implemented with no more than 150 lines of R code. Installing mxnet...

I think that over the past months, I have been saying non-correct things about classification with categorical covariates. Because I never took time to look at it carefuly. Consider some simulated dataset, with a logistic regression, > n=1e3 > set.seed(1) > X1=runif(n) > q=quantile(X1,(0:26)/26) > q=0 > X2=cut(X1,q,labels=LETTERS) > p=exp(-.1+qnorm(2*(abs(.5-X1))))/(1+exp(-.1+qnorm(2*(abs(.5-X1))))) > Y=rbinom(n,size=1,p) > df=data.frame(X1=X1,X2=X2,p=p,Y=Y) Here, we use some continuous covariate, except...

This post was first published on SparkIQ Labs’ blog and re-posted on my personal blog. Introduction The objective of this blog post is demonstrate how to use Apache SparkR to power Shiny applications. I have been curious about what the use cases for a “Shiny-SparkR” application would be and how to develop and deploy such an app.

Karl Broman has written a nice blog post to recommend writing unit tests for R packages. Here are a few more pointers on how to write these tests. I was introduced to unit tests by Barret Schloerke, who asked me to write some for the network plotting functions that I have contributed to the GGally...

Maarten Hermans is a sociologist and researcher at KU Leuven in Belgium and an avid hiker. He uses an Android app to track his location and elevation on his hikes, which means he can download his hike data in GPS Exchange Format. With this data and a few R packages, he was then able to create interactive topological maps...

This tutorial was originally developed for the STAT545 course at UBC, but I decided to publish it shortly afterwards so that more people can benefit from it Shiny is a package from RStudio that can be used to build interactive web pages with R. While that may sound scary because of the words “web pages”, it’s geared...

This tutorial was originally developed for the STAT545 course at UBC, but I decided to publish it shortly afterwards so that more people can benefit from it. This version also contains new sections the original lecture didn’t have. Shiny is a package from RStudio that can be used to build interactive web pages with R. While that...

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