June 2017

A Shiny App to Draw Curves Based on L-System

June 26, 2017 | @aschinchon

Don’t worry about a thing ’cause every little thing gonna be alright (Three Little Birds, Bob Marley) One of my favourite books is The Computational Beauty of Nature by Gary William Flake where there is a fantastic chapter about fractals in which I discovered the L-Systems. L-Systems were conceived  ...
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Useful tricks when including images in Rmarkdown documents

June 26, 2017 | David Smith

Rmarkdown is an enormously useful system for combining text, output and graphics generated by R into a single document. Images, in particular, are a powerful means of communication in a report, whether they be data visualizations, diagrams, or pictures. To maximize the power of those images, Zev Ross has created ... [Read more...]

Weighted population density

June 26, 2017 | dan

DENSITY THE AVERAGE PERSON EXPERIENCES CLICK TO ENLARGE In Alaska, there’s about one person for each square mile of land. You might picture a typical Alaskan not being able to see the next house. But it’s not that way of course. Most of Alaska is uninhabited. People have ... [Read more...]

Visualizing Time Series Data in R

June 26, 2017 | The R Trader

I’m very pleased to announce my DataCamp course on Visualizing Time Series Data in R. This course is also part of the  Time Series with R skills track. Feel free to have a look, the first chapter is free! Course Description As the saying goes, “A chart is worth ... [Read more...]

Check Data Quality with padr

June 26, 2017 | That’s so Random

The padr package was designed to prepare datetime data for analysis. That is, to take raw, timestamped data, and quickly convert it into a tidy format that can be analyzed with all the tidyverse tools. Recently, a colleague and I discovered a second use for the package that I had ...
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Volatility modelling in R exercises (Part-1)

June 26, 2017 | Bassalat Sajjad

Volatility modelling is typically used for high frequency financial data. Asset returns are typically uncorrelated while the variation of asset prices (volatility) tends to be correlated across time. In this exercise set we will use the rugarch package (package description: here) to implement the ARCH (Autoregressive Conditional Heteroskedasticity) model in ... [Read more...]

pixel art of ggplot2 faceting using geofacet

June 26, 2017 | R on Guangchuang Yu

I just discovered an interesting ggplot2 extension, geofacet, that supports arranging facet panels that mimics geographic topoloty. After playing with it, I realized that it is not only for visualizing geo-related data, but also can be fun for presenting data to mimics pixel art. Here is an example using the ...
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H2O Benchmark for CSV Import

June 25, 2017 | statcompute

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(). [Read more...]

bigrquery 0.4.0

June 25, 2017 | Hadley Wickham

I’m pleased to announce that bigrquery 0.4.0 is now on CRAN. bigrquery makes it possible to talk to Google’s BigQuery cloud database. It provides both DBI and dplyr backends so you can interact with BigQuery using either low-level SQL or high-level dplyr verbs. Install the latest version of bigrquery ... [Read more...]

Data visuals notes for my talks in 2017

June 25, 2017 | Bluecology blog

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 sexual dimorphism in elephant ... [Read more...]

Chernoff faces in ggplot2

June 25, 2017 | David Selby

I am pleased to introduce my first R package for general consumption, ggChernoff. Inspiration stems from Leland Wilkinson’s book, The Grammar of Graphics, whose principles were later implemented as the layered grammar of graphics in Hadley Wickham’...
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R Weekly Bulletin Vol – XII

June 25, 2017 | QuantInsti

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 and Replace – Ctrl+F 2. Find Next – F3 3. Find Previous – Shift+F3 Problem Solving Ideas Resolving the ‘: cannot open the connection’ Error ...
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Using Tweedie Parameter to Identify Distributions

June 24, 2017 | statcompute

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 should we use the Gamma distribution instead of the Inverse Gaussian distribution to model the severity? In my previous post ... [Read more...]
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