Monthly Archives: February 2015

Rmetrics Summer Workshop 2015

February 4, 2015
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Photos of the 6th MilanoR meeting

February 4, 2015
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Photos of the 6th MilanoR meeting

Photos of the 6th MilanoR meeting (Milano; December 18, 2014)

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Visualizing Home Ownership With Small Multiples And R

February 4, 2015
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Visualizing Home Ownership With Small Multiples And R

If everybody had an ocean, across the U.S.A., then everybody’d be surfin’ like California (Beach Boys, Surfin’ U.S.A.) I was invited to write a post for Domino Data Lab, a company based in California which provides a cloud-based machine learning platform which enables companies to use the power of the cloud to build analytical projects. I also … Continue reading Visualizing...

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Financial Charts | Pan and Zoom

February 3, 2015
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The htmlwidget for Week 2 over at Building Widgets claims to add pan and zoom interactivity to almost all R charts.  Since their were no tests on financial charts, I thought I would try it out on a couple.  It really does work.  Here is an example ...

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How to Get the Frequency Table of a Categorical Variable as a Data Frame in R

How to Get the Frequency Table of a Categorical Variable as a Data Frame in R

Introduction One feature that I like about R is the ability to access and manipulate the outputs of many functions.  For example, you can extract the kernel density estimates from density() and scale them to ensure that the resulting density integrates to 1 over its support set. I recently needed to get a frequency table of

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Introducing stackr: An R package for querying the Stack Exchange API

February 3, 2015
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Introducing stackr: An R package for querying the Stack Exchange API

There’s no end of interesting data analyses that can be performed with Stack Overflow and the Stack Exchange network of Q&A sites. Earlier this week I posted a Shiny app that visualizes the personalized prediction data from their machine learning system, Providence. I’ve also looked at whether high-reputation users were decreasing their answering activity over time, using data from...

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Tutorial on High-Performance Computing in R

February 3, 2015
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Tutorial on High-Performance Computing in R

I wanted to call your attention to what promises to be an outstanding tutorial on High-Performance Computing (HPC) in R, presented in Web streaming format. My Rth package coauthor Drew Schmidt, who is also one of the authors of the pbdR package, will be one of the presenters.  Should very interesting and useful.

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Base R Assessment!

February 3, 2015
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Base R Assessment!

Test your skills with this R-powered R assessment of base R knowledge! Built using the R powered adaptive testing platform Concerto, this assessment provides a short but powerful tool at evaluating your base R understanding relative to that of your pe...

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Sharing Your Shiny Apps

February 3, 2015
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Sharing Your Shiny Apps

by Siddarth Ramesh R Programmer, Revolution Analytics A couple of months ago, I worked on a customer engagement involving Shiny. Shiny is a package created by RStudio that is intended to make plots dynamic and interactive. One advantage of Shiny is that an app would completely be written in R, without needing to know any other programming languages. Shiny...

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A data.table R tutorial by DataCamp: intro to DT[i, j, by]

February 3, 2015
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A data.table R tutorial by DataCamp:  intro to DT[i, j, by]

This data.table R tutorial explains the basics of the DT command which is core to the data.table package. If you want to learn more on the data.table package, DataCamp provides an interactive R course on the data.table package. The course has more than 35 interactive R exercises – all taking place in the comfort of The post A data.table...

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