March 2016

An Introduction to XGBoost R package

March 10, 2016 | DMLC(distributed machine learning common)

Introduction XGBoost is a library designed and optimized for boosting trees algorithms. Gradient boosting trees model is originally proposed by Friedman et al. The underlying algorithm of XGBoost is similar, specifically it is an extension of the classic gbm algorithm. By employing multi-threads and imposing regularization, XGBoost is able to ...
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P-values: the Continuing Saga

March 10, 2016 | matloff

I highly recommend the blog post by Yoav Benjamini and Tal Galili in defense of (carefully used) p-values. I disagree with much of it, but the exposition is very clear, and there is a nice guide to relevant R tools, including for simultaneous inference, a field in which Yoav is ... [Read more...]

Some Light Image Processing & Creation With R

March 10, 2016 | hrbrmstr

A friend, we’ll call him Alen put a call out for some function that could take an image and produce a per-row “histogram” along the edge for the number of filled-in points. That requirement eventually scope-creeped to wanting “histograms” on both the edge and bottom. In, essence there was ...
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Learn R by Intensive Practice

March 10, 2016 | Selva Prabhakaran

Learn R by Intensive Practice is an introductory R course built especially for beginners who are completely new to R or even to basic programming. This is the first part of a multi-part video lessons aimed to give hands-on learning experience throughout the course. In this and the coming parts, ...
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Bend or break: strings in R

March 10, 2016 | John Mount

A common complaint from new users of R is: the string processing notation is ugly. Using paste(,,sep='') to concatenate strings seems clumsy. You are never sure which regular expression dialect grep()/gsub() are really using. Remembering the difference between length() and nchar() is initially difficult. As always things ...
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Bay Area R User Group at Strata and PAW

March 10, 2016 | Joseph Rickert

by Joseph Rickert I always think of Strata Hadoop World and Predictive Analytics World as initiating the Spring conference season here in the San Francisco Bay Area. The rainy season is usually over by the end of March and it is a perfect time to visit. If you are traveling ... [Read more...]

Histograms by Just Defining Bin Width

March 10, 2016 | fishR Blog

The Problem – Binning for Length Frequency Histograms Fisheries scientists often make histograms of fish lengths. For example, the code below uses hist() (actually hist.formula()) from the FSA package to construct a histogram of total lengths for Chinook Salmon from Argentinian waters. 
<span>library</span><span>(</span><span>FSA</span><span>)</span>
<span>data</span><span>(</span><span>ChinookArg</span><span>)</span>
<span>hist</span><span>(</span><span>~</span><span>tl</span><span>,</span><span>data</span><span>=</span><span>ChinookArg</span><span>,</span><span>xlab</span><span>=</span><span>"Total Length (cm)"</span><span>)</span>
The default bins for these histograms are ... [Read more...]

Sharing htmlwidgets as Gists

March 9, 2016 | ryan hafen

A little-known feature in rbokeh is a function that will save an htmlwidget (including rbokeh figures of course) to a github gist and share it, along with its source code, through services like bl.ocks.org or allow it to be embedded in a web-based docu... [Read more...]

Further Comments on the ASA Manifesto

March 9, 2016 | matloff

On Tuesday I commented here on the ASA (in their words) “Position on p-values:  context, process, and purpose.” A number of readers replied, some of them positive, some mistakenly thinking I don’t think statistical inferences are needed, and some claiming I overinterpreted the ASA’s statement. I’ll respond ... [Read more...]

Add Authentication to Shiny Server with Nginx

March 9, 2016 | Kris Eberwein

Shiny Server is a great tool, but I’ve always found it odd that there was no built-in password authentication. Sure, the Shiny Pro edition has SSL auth., but even for open source projects, I’m not really crazy about just anyone hitting my server whenever they want. To solve ... [Read more...]

Plain Text and Pictures

March 9, 2016 | Kieran Healy

Here are two small sites I made recently, and which I may continue to tweak and expand. The first, plain-text.co, presents “The Plain Person’s Guide to Plain-Text Social Science”. It is designed to address some questions about managin... [Read more...]

Developing a R Tutorial shiny dashboard app

March 9, 2016 | Anup Nair

Through this post, I would like to describe a R Tutorial Shiny app that I recently developed. You can access the app here. (Please open the app on Chrome as some of the features may not work on IE. The app also includes a “ReadMe” introduction which provides a quick ...
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R Tools for Visual Studio preview now available

March 9, 2016 | David Smith

It's official! R Tools for Visual Studio, until now only available as a private preview, is now in public preview and available to everyone as a free, open-source download. RTVS is an add-in for Microsoft Visual Studio, which adds R language development capabilities to the popular Windows-based IDE. If you ... [Read more...]
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