A Review of James Picerno’s Quantitative Investment Portfolio Analytics in R
This is a review of James Picerno’s Quantitative Investment Portfolio Analytics in R. Overall, it’s about as fantastic a book … Continue reading →
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August 2018
Exploring point distribution in the English Premier League
I recently got a hold of table standings for the English Premier League (EPL) for the past 10 years. In this post, I want to explore the question: How similar are the point distributions across seasons? Code for the figures … Continue reading →
GitLab CI for R-package development
A basic R-phile introduction to continuous integration on GitLab [Read more...]
How to Create Sankey Diagrams From Tables (Data Frames) Using R
Step 1: Create a Tidy data frame The very first step in creating visualizations is to get the data in a useful format. In the... [Read more...]
RcppArmadillo 0.9.100.5.0
A new RcppArmadillo release 0.9.100.5.0, based on the new Armadillo release 9.100.5 from earlier today, is now on CRAN and in Debian.
It once again follows our (and Conrad's) bi-monthly release schedule. Conrad started with a new 9.100.* series a fe... [Read more...]
Using the scales package to change alpha in base R plots
When you are plotting many points on one plot, changing the transparency, or alpha, of the points is often a good idea. For example, the plot below plots price vs. carat for each of 53,940 diamonds: We get a mess/mass … Continue reading →
An R package to create NEWS.md files
A while back, I started to create an R package that would help me and my collegues at STATWORX with our daily work. After writing the DESCRIPTION file, I did not want to do this ever again. I found the desc package which let's you parse, manipulate and reformat this ...
Many reports from 1 RMarkdown file
I was at the EdinbR talk this week by the RStudio community lead – Curtis Kephart. It was really interesting, but I disagree with his suggestion to point and click different parameters when… Continue reading →
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Make R speak
Every wanted to make R talk to you? Now you can, with the mscstts package by John Muschelli. It provides an interface to the Microsoft Cognitive Services Text-to-Speech API (hence the name) in Azure, and you can use it to convert any short piece of text to a playable audio ... [Read more...]
Messaging between Python and C++ applications
I recently wanted to create an image-processing pipeline made up of a combination of C++ programs and Python scripts.
Rather than integrating direct communication (or direct calls) within the applications, I wanted flexibility in the design of the pipeline to allow for experimentation.
The solution was to make use of ...
Relative risk ratios and odds ratios by @ellis2013nz
This post tries to explain the difference between odds ratios and relative risk ratios; and how just a few letters in the code fitting a generalized linear model mean the difference between extracting one or the other. There are plenty of other explan... [Read more...]
Great post!
Great post!I wanted to mention that although many previous studies have used the area under receiver operating characteristic curve (auROC) statistic to benchmark the precision, it misleads evaluators when the test data is (highly) imbalanced see: PLOS...
A simple function to install and load packages in R
One function to rule the world, or install or load your packages for you I was starting to despair at the amount of packages I end up using during the task of transforming, cleaning, modelling and validating some of my models. I thought there must be a simple approach to ... [Read more...]
Rstudio::conf diversity scholarships for the win!
Applications for the rstudio::conf(2019) are now open! Last year I was lucky enough to be the receipient of an international diversity scholarships to attend
rstudio::conf(2018). It was hard to believe at first, but it was true!
I live in Uruguay, South America, so it’s extra expensive for ...
Slides from R/Pharma
My slides from the R/Pharma conference on "Modeling in the Tidyverse" are in pdf format as well as the HTML version.
(Joe Cheng just killed it in his shiny presentation - see this...
Bio7 2.9 Released
16.08.2018 A new release of Bio7 is available. The new Bio7 2.9 release comes with a plethora of new R features and bugfixes. Release Notes: General: Based on Eclipse 4.8 Improved the dark theme and the layout of the dark theme in many places All editor font colors are now changed automatically to ...
Linear programming in R
Linear programming is a technique to solve optimization problems whose constraints and outcome are represented by linear relationships.
Simply put, linear programming allows to solve problems of the following kind:
Maximize/minimize $\hat C^T \hat X$
Under the constraint $\hat A \hat X \leq \hat B$
And the constraint $\...
Linear programming in R
Linear programming is a technique to solve optimization problems whose constraints and outcome are represented by linear relationships.
Simply put, linear programming allows to solve problems of the following kind:
Maximize/minimize $\hat C^T \hat X$
Under the constraint $\hat A \hat X \leq \hat B$
And the constraint $\...
Remaking ‘Luminance-gradient-dependent lightness illusion’ with R
A blogpost inspired by a tweet and a YouTube video. ‘Luminance-gradient-dependent lightness illusion’ In the last days, I’ve stumbled upon this tweet: A demo of lightness perception pic.twitter.com/BSVpgcuIw1 — Akiyoshi Kitaoka (@AkiyoshiKitaoka) August 12, 2018 Which is a demonstration of how our perception of color is affected by the ...
How to capitalize on a priori contrasts in linear (mixed) models: A tutorial
We wrote a short tutorial on contast coding, covering the common contrast coding scenarios, among them: treatment, helmert, anova, sum, and sliding (successive differences) contrasts. The target audience is psychologists and linguists, but really it is for anyone doing planned experiments. The paper has not been submitted anywhere yet. We ... [Read more...]
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