H2O Benchmark for CSV Import

June 25, 2017
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H2O Benchmark for CSV Import

The importFile() function in H2O is extremely efficient due to the parallel reading. The benchmark comparison below shows that it is comparable to the read.df() in SparkR and significantly faster than the generic read.csv().

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Data visuals notes for my talks in 2017

June 25, 2017
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Data visuals notes for my talks in 2017

Data visuals: notes for my talks in 2017 Supplementary notes for CJ Brown’s talks on dataviz in 2017 for Griffith University’s honours students and the UQ Winterschool in Bioinformatics. Skip to the quiz Visualsing...

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Data Visualization with googleVis exercises part 4

June 25, 2017
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Data Visualization with googleVis exercises part 4

Adding Features to your Charts We saw in the previous charts some basic and well-known types of charts that googleVis offers to users. Before continuing with other, more sophisticated...

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R Weekly Bulletin Vol – XII

June 25, 2017
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R Weekly Bulletin Vol – XII

This week’s R bulletin will cover topics on how to resolve some common errors in R. Hope you like this R weekly bulletin. Enjoy reading! Shortcut Keys 1. Find...

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Using Tweedie Parameter to Identify Distributions

June 24, 2017
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Using Tweedie Parameter to Identify Distributions

In the development of operational loss models, it is important to identify which distribution should be used to model operational risk measures, e.g. frequency and severity. For instance, why...

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Using tidycensus and leaflet to map Census data

June 23, 2017
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Recently, I have been following the development and release of Kyle Walker’s tidycensus package. I have been filled with amazement, delight, and well, perhaps another feeling…

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Track changes in data with the lumberjack %>>%

June 23, 2017
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Track changes in data with the lumberjack %>>%

So you are using this pipeline to have data treated by different functions in R. For example, you may be imputing some missing values using the simputation package. Let...

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The R community is one of R’s best features

June 23, 2017
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The R community is one of R’s best features

R is incredible software for statistics and data science. But while the bits and bytes of software are an essential component of its usefulness, software needs a community to...

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Logarithmic Scale Explained with U.S. Trade Balance

June 23, 2017
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Logarithmic Scale Explained with U.S. Trade Balance

Skewed data prevail in real life. Unless you observe trivial or near constant processes data is skewed one way or another due to outliers, long tails, errors or something...

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Working With SPSS© Data in R

Working With SPSS© Data in R

Introduction I was in need of importing SPSS© data for work. There are some options but I've used both foreign and haven R packages. I prefer haven because it integrates...

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State-space modelling of the Australian 2007 federal election

June 23, 2017
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State-space modelling of the Australian 2007 federal election

Pooling the polls with Bayesian statistics In an important 2005 article in the Australian Journal of Political Science, Simon Jackman set out a statistically-based approach to pooling polls in an...

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Operations Research with R

June 23, 2017
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Stefan Feuerriegel This blog entry concerns our course on “Operations Reserch with R” that we teach as part of our study program. We hope that the materials are of...

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Hey! You there! You are welcome here

June 23, 2017
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Hey! You there! You are welcome here

What's that? You've heard of R? You use R? You develop in R? You know someone else who's mentioned R? Oh, you're breathing? Well, in that case, welcome! Come...

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Face Recognition in R

June 22, 2017
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Face Recognition in R

Face Recognition in R OpenCV is an incredibly powerful tool to have in your toolbox. I have had a lot of success using it in Python but very little...

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May New Package Picks

June 22, 2017
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May New Package Picks

Two hundred and twenty-nine new packages were submitted to CRAN in May. Here are my picks for the “Top 40”, organized...

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Set Theory Arbitrary Union and Intersection Operations with R

June 22, 2017
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Part 3 of 3 in the series Set TheoryThe union and intersection set operations were introduced in a previous post using two sets, and . These set operations can...

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RTutor: Emission Certificates and Green Innovation

RTutor: Emission Certificates and Green Innovation

Which policy instruments should we use to cost-effectively reduce greenhouse gas emissions? For a given technological level there are many economic arguments in favour of tradeable emission certificates or...

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Interactive R visuals in Power BI

June 22, 2017
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Interactive R visuals in Power BI

Power BI has long had the capability to include custom R charts in dashboards and reports. But in sharp contrast to standard Power BI visuals, these R charts were...

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Two years as a Data Scientist at Stack Overflow

June 22, 2017
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Two years as a Data Scientist at Stack Overflow

Last Friday marked my two year anniversary working as a data scientist at Stack Overflow. At the end of my first year I wrote a blog post about...

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Online portfolio allocation with a very simple algorithm

June 22, 2017
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Online portfolio allocation with a very simple algorithm

By Yuri Resende   Today we will use an online convex optimization technique to build a very simple algorithm for portfolio allocation. Of course this is just an illustrative...

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Data wrangling : Reshaping

June 22, 2017
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Data wrangling : Reshaping

Data wrangling is a task of great importance in data analysis. Data wrangling, is the process of importing, cleaning and transforming raw data into actionable information for analysis. It...

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nanotime 0.2.0

June 22, 2017
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A new version of the nanotime package for working with nanosecond timestamps just arrived on CRAN. nanotime uses the RcppCCTZ package for (efficient) high(er) resolution time...

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Can we predict flu deaths with Machine Learning and R?

June 22, 2017
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Can we predict flu deaths with Machine Learning and R?

Among the many R packages, there is the outbreaks package. It contains datasets on epidemics, on of which is from the 2013 outbreak of influenza A H7N9 in China,...

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Introducing Community Tutorials

June 22, 2017
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Introducing Community Tutorials

Today we’re introducing Datazar Community Tutorials. At Datazar, we love writing tutorials and how-tos on R, Python, D3, research and science best practices in general. So starting today, we’re...

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All the fake data that’s fit to print

June 22, 2017
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charlatan makes fake data. Excited to annonunce a new package called charlatan. While perusing packages from other programming languages, I saw a neat Python library called faker. charlatan is inspired from and ports...

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Plotting partial pooling in mixed-effects models

June 21, 2017
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Plotting partial pooling in mixed-effects models

In this post, I demonstrate a few techniques for plotting information from a relatively simple mixed-effects model fit in R. These plots can help us develop intuitions about what these...

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RcppCCTZ 0.2.3 (and 0.2.2)

June 21, 2017
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A new minor version 0.2.3 of RcppCCTZ is now on CRAN. RcppCCTZ uses Rcpp to bring CCTZ to R. CCTZ is a C++ library for translating between absolute and...

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Large integers in R: Fibonacci number with 1000 digits, Euler Problem 25

June 21, 2017
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Large integers in R: Fibonacci number with 1000 digits, Euler Problem 25

Solution to Euler Problem 25 in the R language. What is the index of the first term in the Fibonacci sequence to contain 1000 digits? Continue reading

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Confidence Intervals without Your Collaborator’s Tears

June 21, 2017
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Confidence Intervals without Your Collaborator’s Tears

Abstract We provide an interpretation for the confidence interval for a binomial proportion hidden as the transcript of an hypothetical statistical consulting session. ...

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