reaching transcendence for Gaussian mixtures

September 2, 2015
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reaching transcendence for Gaussian mixtures

“…likelihood inference is in a fundamental way more complicated than the classical method of moments.” Carlos Amendola, Mathias Drton, and Bernd Sturmfels arXived a paper this Friday on “maximum likelihood estimates for Gaussian mixtures are transcendental”. By which they mean that trying to solve the five likelihood equations for a two-component Gaussian mixture does not

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Top 10 Reasons why you should attend the EARL R London Conference

September 2, 2015
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Top 10 Reasons why you should attend the EARL R London Conference

On September 14th-16th Mango Solutions are running the EARL ( Effective Applications of the R Language) Conference for all users, enthusiasts and beginners of the R programming language. It...

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Using the googlesheets package to work with Google Sheets

September 2, 2015
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by Andrie de Vries Just more than a year ago I cobbled together some code to work with the (then) new version of Google Sheets. You can still find...

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Correction For Spatial And Temporal Auto-Correlation In Panel Data: Using R To Estimate Spatial HAC Errors Per Conley

September 2, 2015
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Correction For Spatial And Temporal Auto-Correlation In Panel Data: Using R To Estimate Spatial HAC Errors Per Conley

Darin Christensen and Thiemo Fetzer tl;dr: Fast computation of standard errors that allows for serial and spatial auto-correlation. Economists and political scientists often employ panel data that track units...

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Mathematical annotations on R plots

September 2, 2015
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Mathematical annotations on R plots

I’ve always struggled with using plotmath via the expression function in R for adding mathematical notation to axes or legends. For some reason, the most obvious way to write...

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Unit Converter

September 1, 2015
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Introduction Dan continues to crank out book chapter-length posts, which probably means that I should jump in before getting further behind…so here we go. In the next few posts, I’d...

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Logistic Regression in R – Part One

September 1, 2015
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Logistic Regression in R – Part One

Please note that an earlier version of this post had to be retracted because it contained some content which was generated at work. I have since chosen to rewrite...

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Yahoo Finance (CSI) Data Quirks. Or Why is the ROC not Stable?

September 1, 2015
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Yahoo Finance (CSI) Data Quirks. Or Why is the ROC not Stable?

Rotational strategies on ETFs have been a common occurrence on this blog, and I have been using something similar for real life trading for about two years now. Readers...

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Looking after Datasets

September 1, 2015
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Looking after Datasets

by Antony Unwin University of Augsburg, Germany David Moore's definition of data: numbers that have been given a context. Here is some context for the finch dataset: Fig 1:...

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Learning Italian with rvest and Duolingo

September 1, 2015
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Learning Italian with rvest and Duolingo

  By Aimee Gott,  R Consultant, Mango Solutions Over the last month I have found multiple reasons for needing to scrape web pages for information. This started out with...

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Reasons to Learn R

September 1, 2015
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Reasons to Learn R

A new blog post over at Pluralsight describes reasons R has been generating a great deal of interest in recent days:  http://blog.pluralsight.com/r-programming-language.

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Bayesian regression models using Stan in R

September 1, 2015
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Bayesian regression models using Stan in R

It seems the summer is coming to end in London, so I shall take a final look at my ice cream data that I have been playing around with...

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About to teach Statistical Graphics and Visualization course at CMU

August 31, 2015
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About to teach Statistical Graphics and Visualization course at CMU

I’m pretty excited for tomorrow: I’ll begin teaching the Fall 2015 offering of 36-721, Statistical Graphics and Visualization. This is a half-semester course designed primarily for students in our...

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likelihood-free inference in high-dimensional models

August 31, 2015
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likelihood-free inference in high-dimensional models

“…for a general linear model (GLM), a single linear function is a sufficient statistic for each associated parameter…” The recently arXived paper “Likelihood-free inference in high-dimensional models“, by Kousathanas...

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Revolution R Enterprise Now Available in the Cloud on Azure Marketplace

August 31, 2015
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by Richard Kittler, Revolution R Enterprise PM, Microsoft Advanced Analytics Revolution is excited to announce the availability of its latest release of Revolution R Enterprise 7.4.1 (RRE) as a...

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Two little annoying stats detail

August 31, 2015
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Two little annoying stats detail

A very brief post at the end of the field season on two little “details” that are annoying me in paper/analysis that I see being done (sometimes) around me....

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16 new R jobs (from R-users.com ; 2015-08-31)

August 31, 2015
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16 new R jobs (from R-users.com ; 2015-08-31)

This is the bimonthly post (for 2015-08-31) for new R Jobs from R-users.com. Employers: you may visit this link to post a new R job to the R community (it’s free and quick). Job seekers: please follow the links below...

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embeding a subplot in ggplot via subview

August 30, 2015
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embeding a subplot in ggplot via subview

I implemented a function, subview, in ggtree that make it easy to embed a subplot in ggplot. An example is shown below: Read more »

Advanced Tips and Tricks with data.table

August 30, 2015
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Tips and tricks learned along the way 1. DATA STRUCTURES & ASSIGNMENT => Columns of lists => Suppressing intermediate output with {} ...

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Visualizing Twitter history with streamgraphs in R

August 30, 2015
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I was exploring ways to visualize my Twitter history, and ended up creating this interactive streamgraph of my 20 most used hashtags in Twitter: The graph shows how my...

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GEOSTAT 2015: a write-up

August 30, 2015
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GEOSTAT 2015: a write-up

The week before last I attended the GEOSTAT summer school in Lancaster. GEOSTAT is an annual week-long meeting devoted to ‘geostatistics’ (or ‘spatial statistics’ - we’ll come on...

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RcppGSL 0.3.0

August 30, 2015
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A new version of RcppGSL just arrived on CRAN. The RcppGSL package provides an interface from R to the GNU GSL using our

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“A 99% TVaR is generally a 99.6% VaR”

August 29, 2015
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“A 99% TVaR is generally a 99.6% VaR”

Almost 6 years ago, I posted a brief comment on a sentence I found surprising, by that time, discovered in a report claiming that the expected shortfall  at the 99 % level corresponds...

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Building Wordclouds in R

August 28, 2015
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Building Wordclouds in R

In this article, I will show you how to use text data to build word clouds in R. We will use a dataset containing around 200k Jeopardy questions. The...

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Bio7 2.3 Released!

August 28, 2015
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Bio7 2.3 Released!

28.08.2015 As a result of the useR conference 2015 with fantastic workshops and presentations where I also presented my software I released a new version of Bio7 with many...

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A Closer Look at TAT Time Dependence

A Closer Look at TAT Time Dependence

The Problem We want to have a closer look at the time–dependence of turn around times (TATs). In particular, we would like to see if there is a significant...

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Get to know Cortana Analytics: Workshop and webinars

August 28, 2015
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Get to know Cortana Analytics: Workshop and webinars

Cortana Analytics Suite is Microsoft's cloud-based big data and advanced analytics suite. It includes a complete set of all the services need to build advanced analytics applications: from data...

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The IQUIT R video series

August 28, 2015
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I’ve uploaded 20+ R tutorials to YouTube for a new undergraduate course in Ecology and Evolutionary Biology at CU developed by Andrew Martin and Brett Melbourne, which...

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Legoplots in R (3D barplots in R)

August 28, 2015
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Legoplots in R (3D barplots in R)

I previously mentioned these, but I thought about it some more and went ahead and wrote an R implementation.  With very little work you could rejig this code to...

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