2016

Calculating AUC: the area under a ROC Curve

November 22, 2016 | Guest Blogger

by Bob Horton, Microsoft Senior Data Scientist Receiver Operating Characteristic (ROC) curves are a popular way to visualize the tradeoffs between sensitivitiy and specificity in a binary classifier. In an earlier post, I described a simple “turtle’s eye view” of these plots: a classifier is used to sort cases ... [Read more...]

Reading data from google sheets into R

November 22, 2016 | biomickwatson

Reading data from google sheets into R is something you imagine should be really simple, but often is anything but. However, package googlesheets goes a long way to solving this problem. Let’s crack on with an example. First, install the software: install.packages("googlesheets") We then need an example ... [Read more...]

The rOpenSci geospatial suite

November 22, 2016 | Scott Chamberlain

Geospatial data - data embedded in a spatial context - is used across disciplines, whether it be history, biology, business, tech, public health, etc. Along with community contributors, we're working on a suite of tools to make working with spatial data in R as easy as possible. If you're not ... [Read more...]

Create a Correlation Matrix in R

November 21, 2016 | Douglas E Rice

So, in my last post, I showed how to create two histograms from a certain data set and then how to plot the two variables to see if there is any relationship. Visually, it was easy to tell that there was a negative relationship between the weight of an automobile ...
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Piping Within Pipes

November 21, 2016 | Random R Ramblings

The magrittr pipe (%__%) has revolutionised the way many people now write R code. I’ve been using R for over 7 years and the pipe has become a staple of my programming conventions. However it was recently brought to my attention that you can actually use pipes within function calls, which ...
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Descriptive Analytics-Part 4 : Data Manipulation

November 21, 2016 | Vasileios Tsakalos

Descriptive Analytics is the examination of data or content, usually manually performed, to answer the question “What happened?”. In order to be able to solve this set of exercises you should have solved the part 0, part 1, part 2 ,and part 3 of this series but also you should run this script which ... [Read more...]

Fusion and Runtime Compilation for NNVM and TinyFlow

November 20, 2016 | DMLC

Fusion and Runtime Compilation Today’s deep learning models perform tens of thousands of operations on GPU. The input and output of each GPU kernel has to be stored in the global memory, but read and write on global memory is much slower than on on-chip register. When some special ...
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Lord’s Paradox in R

November 20, 2016 | Andrés Gutiérrez

In an article called A Paradox in the Interpretation of Group Comparisons published in Psychological Bulletin, Lord (1967) made famous the following controversial story:A university is interested in investigating the effects of the nutritional diet its...
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