Introduction to Rolling Volatility

July 17, 2017
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This is the second post in our series on portfolio volatility, variance and standard deviation. If you missed the first post and want to start at the beginning with calculating portfolio volatility, have a look here - Introduction to Volatility. We will use three objects created in that previous post, so a quick peek is recommended. Today we focus on...

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Young people neither in employment nor in education and training in Europe, 2000-2016

July 17, 2017
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Young people neither in employment nor in education and training in Europe, 2000-2016

R Documentation at Stack Overflow One of the nice features of R is the ease of data acquisition. I am now working on the examples of data acquisition form different sources within an R session. Soon I am going publish a long-read with an overview of demographic data acquisition in R.

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Ecosystems chapter added to “Empirical software engineering using R”

July 17, 2017
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The Ecosystems chapter of my Empirical software engineering book has been added to the draft pdf (download here). I don’t seem to be able to get away from rewriting everything, despite working on the software engineering material for many years. Fortunately the sparsity of the data keeps me in check, but I keep finding new

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Ten-HUT! The Apache Drill R interface package — sergeant — is now on CRAN

July 17, 2017
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I’m extremely pleased to announce that the sergeant package is now on CRAN or will be hitting your local CRAN mirror soon. sergeant provides JDBC, DBI and dplyr/dbplyr interfaces to Apache Drill. I’ve also wrapped a few goodies into the dplyr custom functions that work with Drill and if you have Drill UDFs that don’t... Continue reading →

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Revisiting the useR!2017 conference: Recordings now available

July 17, 2017
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Revisiting the useR!2017 conference: Recordings now available

The annual useR!2017 conference took place July 4-7 in Brussels, and in every dimension it was the best yet. It was the largest (with over 1,100 R users from around the world in attendance), and yet still very smoothly run with many amazing talks and lots of fun for everyone. If you weren't able to make it to Brussels,...

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Twitter analysis using R (Semantic analysis of French elections)

July 17, 2017
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Last month the French elections viewed through Twitter: a semantic analysis post showed how the two contenders were perceived on Twitter during three key events of the campaign (Macron leaks, presidential debate and election day). The goal of the post is to show how to perform this twitter analysis using R. Collecting tweets in real time with The post Twitter analysis...

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No time wasting

July 17, 2017
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No time wasting

...

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Top reasons to send your team to EARL

July 17, 2017
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Top reasons to send your team to EARL

...

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Volatility modelling in R exercises (Part-4)

July 17, 2017
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Volatility modelling in R exercises (Part-4)

This is the fourth part of the series on volatility modelling. For other parts of the series follow the tag volatility. In this exercise set we will explore GARCH-M and E-GARCH models. We will also use these models to generate rolling window forecasts, bootstrap forecasts and perform simulations. Answers to the exercises are available here. Related exercise sets: Volatility modelling...

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Structural Changes in Global Warming

July 17, 2017
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Structural Changes in Global Warming

In time series analysis, structural changes represent shocks impacting the evolution with time of the data generating process. That is relevant because one of the key assumptions of the Box-Jenkins methodology is that the structure of the data generating process does not change over time. How can structural changes be identified ? The strucchange package Related Post Deep Learning with...

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Global convergence in male life expectancy at birth

July 16, 2017
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Global convergence in male life expectancy at birth

In the modern history, the world has seen unprecedented decrease in human mortality – the result of the Demographic Transition. Initially, the improvements occurred only in the most developed societies, and by the mid XX century the world population was roughly divided in two parts according to mortality patterns (see the bi-modal distribution). After the 2nd World War, the...

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How to do Optical Character Recognition (OCR) of non-English documents in R using Tesseract?

July 16, 2017
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How to do Optical Character Recognition (OCR) of non-English documents in R using Tesseract?

One of the many great packages of rOpenSci has implemented the open source engine Tesseract. Optical character recognition (OCR) is used to digitize written or typed documents, i.e. photos or scans of text documents are “translated” into a digital...

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Data visualization with googleVis exercises part 7

July 16, 2017
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Data visualization with googleVis exercises part 7

Table, Org Chart & Tree Map In the seventh part of our series we are going to learn about the features of some interesting types of charts. More specifically we will talk about Table, Org Chart and Tree Map. Read the examples below to understand the logic of what we are going to do and Related exercise sets: Data Visualization...

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Investigating Cryptocurrencies using R

July 15, 2017
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Investigating Cryptocurrencies using R

Cryptocurrencies are a fascinating phenomenon and excellent data source for analysis with R.  This post will introduce how to get a list of available currencies into R.  Wikipedia maintains a page with a list of cryptocurrencies.  These can be read from HTML into a data frame.library(httr)library(XML)results = GET("https://en.wikipedia.org/wiki/List_of_cryptocurrencies")doc = readHTMLTable(doc=content(results, "text"))View(doc)This list is not complete.  Also, an API would...

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dplyr 0.7 Made Simpler

July 15, 2017
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I have been writing a lot (too much) on the R topics dplyr/rlang/tidyeval lately. The reason is: major changes were recently announced. If you are going to use dplyr well and correctly going forward you may need to understand some of the new issues (if you don’t use dplyr you can safely skip all of … Continue reading dplyr...

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Rcpp 0.12.12: Rounding some corners

July 15, 2017
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The twelveth update in the 0.12.* series of Rcpp landed on CRAN this morning, following two days of testing at CRAN preceded by five full reverse-depends checks we did (and which are always logged in this GitHub repo). The Debian package has been built and uploaded; Windows and macOS binaries should follow at CRAN as usual. This 0.12.12 release...

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Generalized Additive Models and Mixed-Effects in Agriculture

July 15, 2017
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Generalized Additive Models and Mixed-Effects in Agriculture

IntroductionIn the previous post I explored the use of linear model in the forms most commonly used in agricultural research.Clearly, when we are talking about linear models we are implicitly assuming that all relations between the dependent variable y and the predictors x are linear. In fact, in a linear model we could specify different shapes for the relation...

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Keynote speaker announcement: David Robinson – Stack Overflow

July 15, 2017
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Keynote speaker announcement: David Robinson – Stack Overflow

...

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R Weekly Bulletin Vol – XIII

July 15, 2017
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R Weekly Bulletin Vol – XIII

This week’s R bulletin covers some interesting plotting methods. Hope you like this R weekly bulletin. Enjoy reading! Shortcut Keys 1. Source a file – Ctrl+Shift+O 2. Source the current document – Ctrl+Shift+S 3. Find in Files – Ctrl+Shift+F Problem Solving Ideas Using Multiple Colors for Plotting a Variable Plotting a variable with multiple colors... The post R Weekly Bulletin...

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Stan Weekly Roundup, 14 July 2017

July 14, 2017
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Another week, another bunch of Stan updates. Kevin Van Horn and Elea McDonnell Feit put together a tutorial on Stan that covers linear regression, multinomial logistic regression, and hierarchical multinomial logistic regression. Andrew has been working on writing up our “workflow,” by which he means not only the three-step process of Ben Goodrich The post Stan Weekly...

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R in Minecraft: the lightning talk

July 14, 2017
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My lightning talk at the useR!2017 conference was R in Minecraft: a five-minute tour of the miner and craft packages and associated book designed to teach kids how to use the R language while manipulating the world of Minecraft. You can see my talk below (starting at the 10:40 mark), and the slides (mostly created in Minecraft) are available...

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Hacking strings with stringr

July 14, 2017
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Hacking strings with stringr

This is first of the set of exercise on string manipulation with stringr Answers to the exercises are available here. If you obtained a different (correct) answer than those listed on the solutions page, please feel free to post your answer as a comment on that page. Exercise 1 use a stringr function to merge Related exercise sets: Regular Expressions...

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Install GNU and non-GNU Tools via Homebrew

Why should you do this? On Install R and Python via Homebrew I described some potential problems when using R or Python libraries. After doing a fresh OS X install I had some problems with \(\LaTeX\) and XQuartz. The root of the problem is directories location that is easily solved with Homebrew as it doesn't touch the system and provides symlinks...

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ergastR – R Wrapper for ergast F1 Results Data API

July 14, 2017
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ergastR – R Wrapper for ergast F1 Results Data API

By the by, I’ve posted a first attempt at an R package – ergastR to wrap the ergast developer API, which is where I get chunks of data from for my f1datajunkie tinkerings. You can find it on Github: psychemedia/ergastR. The function names are the ones used in the Wrangling F1 Data With R book. The

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useR!2017: Analysing Learning Patterns with R

July 14, 2017
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useR!2017: Analysing Learning Patterns with R

Teaching R to students with little to no experience in programming or data analysis is a challenging task. Our talk at useR!2017 showed how different ingredients of our course Exploratory and Descriptive Data Analysis at UHasselt are used to facilitate … Continue reading →

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Announcing OpenCPU 2.0: Building and Deploying Scalable R Apps and Services

July 13, 2017
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Announcing OpenCPU 2.0: Building and Deploying Scalable R Apps and Services

OpenCPU 2.0 provides the most robust system available today for building and deploying R based apps and services. The server exposes a simple HTTP API for calling with R functions, scripts and managing data, which provides a very solid basi...

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Deep Learning for Brand Logo Detection – part II

July 13, 2017
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Deep Learning for Brand Logo Detection – part II

A month ago, I started playing with the deep learning framework Keras for R. As a use-case I picked logo detection in images. While the training of a net worked out fine, the results were mediocre. (Check out the full post to for details on the model a...

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20 years of CRAN

July 13, 2017
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The presentations and tutorials are starting to become available at the Channel 9 useR!2017 page. There's a wealth of amazing content to explore there already, and I wanted to call out one presentation in particular: Uwe Ligges' keynote presentation, 20 years of CRAN. There are many reasons for the success of R: the language itself, the mathematical and statistical...

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Lagrangian Polynomial Interpolation with R

July 13, 2017
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Lagrangian Polynomial Interpolation with R

Part 2 of 4 in the series Numerical AnalysisPolynomial interpolation is the method of determining a polynomial that fits a set of given points. There are several approaches to polynomial interpolation, of which one of the most well known is the Lagrangian method. This post will introduce the Lagrangian method... The post Lagrangian Polynomial Interpolation with R appeared first on...

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