Sketchnotes from TWiML&AI: Adversarial Attacks Against Reinforcement Learning Agents with Ian Goodfellow & Sandy Huang

May 13, 2018
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Sketchnotes from TWiML&AI: Adversarial Attacks Against Reinforcement Learning Agents with Ian Goodfellow & Sandy Huang

These are my sketchnotes for Sam Charrington’s podcast This Week in Machine Learning and AI about Adversarial Attacks Against Reinforcement Learning Agents with Ian Goodfellow & Sandy Huang: Sketchnotes from TWiMLAI talk: Adversarial Attacks Against Reinforcement Learning Agents with Ian Goodfellow & Sandy Huang You can listen to the podcast here. In this episode, I’m joined by Ian Goodfellow, Staff Research Scientist...

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sparklyr 0.8

May 13, 2018
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sparklyr 0.8

We’re pleased to announce that sparklyr 0.8 is now available on CRAN! Sparklyr provides an R interface to Apache Spark. It supports dplyr syntax for working with Spark DataFrames and exposes the full range of machine learning algorithms available in Spark ML. You can also learn more about Apache Spark and sparklyr at spark.rstudio.com and the sparklyr webinar series....

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Sketchnotes from TWiML&AI: Adversarial Attacks Against Reinforcement Learning Agents with Ian Goodfellow & Sandy Huang

May 13, 2018
By
Sketchnotes from TWiML&AI: Adversarial Attacks Against Reinforcement Learning Agents with Ian Goodfellow & Sandy Huang

These are my sketchnotes for Sam Charrington’s podcast This Week in Machine Learning and AI about Adversarial Attacks Against Reinforcement Learning Agents with Ian Goodfellow & Sandy Huang: Sketchnotes from TWiMLAI talk: Adversarial Attacks Against Reinforcement Learning Agents with Ian Goodfellow & Sandy Huang You can listen to the podcast here. In this episode, I’m joined by Ian Goodfellow, Staff Research Scientist...

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Is non-inferiority on par with superiority?

May 13, 2018
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Is non-inferiority on par with superiority?

It is grant season around here (actually, it is pretty much always grant season), which means another series of problems to tackle. Even with the most straightforward study designs, there is almost always some interesting twist, or an approach that presents a subtle issue or two. In this case, the investigator wants compare two interventions, but doesn’t feel the...

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CRAN Release of R/exams 2.3-1

May 13, 2018
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CRAN Release of R/exams 2.3-1

New minor release of the R/exams package to CRAN, containing a wide range of smaller improvements and bug fixes. Notable new features include a dedicated OpenOLAT interface, and a convenience function facilitating the use of TikZ-based graphics. Version 2.3-1 of...

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Taking the baseline measurement into account

May 13, 2018
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Taking the baseline measurement into account

In Randomized Controlled Trials (RCTs), a “Pre” measurement is often taken at baseline (before randomization), and treatment effects are measured at one or more time point(s) after randomization (“Post” measurements). There are many ways to take the baseline measurement into account when comparing 2 groups in a classic pre-post design with one post measurement. In The post Taking the...

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Statistics Sunday: Taylor Swift vs. Lorde – Analyzing Song Lyrics

May 13, 2018
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Statistics Sunday: Taylor Swift vs. Lorde – Analyzing Song Lyrics

Statistics Sunday Last week, I showed how to tokenize text. Today I'll use those functions to do some text analysis of one of my favorite types of text: song lyrics. Plus, this is a great opportunity to demonstrate a new R package I discovered: geniusR, which will download lyrics from Genius.There are two packages - geniusR and geniusr...

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Tips for Ellipse Summary Plot

May 12, 2018
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Tips for Ellipse Summary Plot

I privately had some questions and reply here, because it may also help others including me. 1. How to specify size With plot axis parameters. __ ellipseplot(iris, iris, … Continue reading →

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AphA Scotland – it’s a thing

May 12, 2018
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Reflections on AphA Scotland launch event - On Tues 8th May there was only one Scottish based member of the Association of Professional Healthcare Analysts (me) but on Wed 9th May that number rose to around 80 with the launch of the the Scotland AphA Branch. The event took place in the very nice Perth Concert Hall, and...

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Transactional Cost on High Frequency Trading

May 12, 2018
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Transactional Cost on High Frequency Trading

Special thanks to my great teammate, Qiang Ji. This research explores two execution approaches i.e Market Taking and Opportunistic Market Making. In short, Market Taking (MT) method allows us to send market order and aggress market immediately with the latest quotes. While, Opportunistic Market Making (OMM) method is more risky, which will send limit orders

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automaton: Interpretation of Automaton Diagrams (Using TikZ)

May 12, 2018
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automaton: Interpretation of Automaton Diagrams (Using TikZ)

Exercise template for assessing the interpretation of an automaton diagram (drawn with TikZ) based on randomly generated input sequences. Name: automaton Type: mchoice Related: logic Description: An automaton diagram with four states A-D is drawn with...

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logic: Interpretation of Logic Gates (Using TikZ)

May 12, 2018
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logic: Interpretation of Logic Gates (Using TikZ)

Exercise template for matching logic gate diagrams (drawn with TikZ) to the corresponding truth table. Name: logic Type: schoice Related: automaton Description: Gate diagrams for three logical operators (sampled from: and, or, xor, nand, nor) are...

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Do know Shake Shack’s locations outside of the US? You’d be surprised

May 12, 2018
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Do know Shake Shack’s locations outside of the US? You’d be surprised

Madison Shake I had heard that the lines to get some food at Shake Shack are long. So when I saw a new location opening in downtown LA, I wondered how many locations does it have and how fast are they spreading across the US. The answers surprised me. Using R and previous code, I The post Do know...

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RStudio:addins part 2 – roxygen documentation formatting made easy

May 12, 2018
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RStudio:addins part 2 – roxygen documentation formatting made easy

Introduction Code documentation is extremely important if you want to share the code with anyone else, future you included. In this second post in the RStudio:addins series we will pay a part of our technical debt from the previous article and document our R functions conveniently using a new addin we will build for this purpose. The addin we will create...

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Fifteen New Zealand government Shiny web apps by @ellis2013nz

Fifteen New Zealand government Shiny web apps by @ellis2013nz

At a glance: I had a brief look around New Zealand government agency websites and found 15 high quality web apps written in the Shiny platform. 13 May 2018 Here’s fifteen nice web applications built with RStudio’s Shiny framework. All of these are owned and maintained by New Zealand government departments and have a main purpose as making public data more...

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Investing for the Long Run

May 12, 2018
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Investing for the Long Run

- I often get asked about how to invest in the stock market. Not surprisingly, this has been a common topic in my classes. Brazil is experiencing a big change in its financial scenario. Historically, fixed income instruments paid a large premium over the stock market and that is no longer the case....

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Enterprise Advocate

May 11, 2018
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Enterprise Advocate

We are looking for our next Enterprise Advocate to join the RStudio team. See what Pete Knast, Global Director of New Business, has to say about working at RStudio and the Enterprise Advocate role. When did you join RStudio and what made yo...

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Visualizing graphs with overlapping node groups

May 11, 2018
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Visualizing graphs with overlapping node groups

I recently came across some data about multilateral agreements, which needed to be visualized as network plots. This data had … Read More →

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Monte Carlo-based prediction intervals for nonlinear regression

May 11, 2018
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Monte Carlo-based prediction intervals for nonlinear regression

Calculation of the propagated uncertainty using (1), where is the gradient and the covariance matrix of the coefficients , is called the “Delta Method” and is widely applied in nonlinear least-squares (NLS) fitting. However, this method is based on first-order Taylor expansion and thus assummes linearity around . The second-order approach can partially correct for

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Custom R charts coming to Excel

May 11, 2018
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Custom R charts coming to Excel

This week at the BUILD conference, Microsoft announced that Power BI custom visuals will soon be available as charts with Excel. You'll be able to choose a range of data within an Excel workbook, and pass those data to one of the built-in Power BI custom visuals, or one you've created yourself using the API. Since you can create...

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How to Plot With Dygraphs

May 11, 2018
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The dygraphs package is an R interface to the dygraphs JavaScript charting library. It provides rich facilities for charting time-series data in R, including: 1. Automatically plots xts time-series objects (or any object convertible to xts.) 2. Highly configurable axis and series display (including optional second Y-axis.) 3. Rich interactive features, including zoom/pan and series/point Related exercise sets:Spatial Data...

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goodpractice 1.0.2 on CRAN

May 11, 2018
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goodpractice 1.0.2 on CRAN

Hannah Frick, Data Scientist We are excited to annouce that the goodpractice package is now available on CRAN. The package gives advice about good practices when building R packages. Advice includes functions and syntax to avoid, package structure, code complexity, code formatting, etc. You can install the CRAN version via install.packages("goodpractice") Building R packages Building an R package is a great way of encapsulating code, documentation and data...

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Basic R Automation

May 11, 2018
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Last Wednesday, a small presentation was given at the RBelgium meetup in Brussels on Basic R Automation. For those of you who could not attend, here are the slides of that presentation which showed the use of the cronR and taskscheduleR R packages for ...

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Agile Data Science: Improving Your Workflow with Scrum

May 11, 2018
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Agile Data Science: Improving Your Workflow with Scrum

… The post Agile Data Science: Improving Your Workflow with Scrum appeared first on Vertabelo Academy Blog.

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Create and Format a Google Sheet Within R: Exercises

May 10, 2018
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Create and Format a Google Sheet Within R: Exercises

In this exercise set, we will practice using the Google Sheets package to create and manipulate a Google spreadsheet within R. After completing this exercise set, you will be able to prepare a basic Google Sheets document using just R, leaving behind a reproducible R-script. Note that using Google Sheets is free of cost, but Related exercise sets:Spatial Data...

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Counting Patent First Filings the Tidy Way with R

Counting Patent First Filings the Tidy Way with R

This article provides an in depth introduction to counting patent first filings or priority counts. It is a work in progress chapter for the WIPO Patent Analytics Handbook focusing on advanced patent analytics and builds on the introductory WIPO Manual on Open Source Patent Analytics. Counting first filings is an important subject for patent statistics because the first filing of...

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Rstudio + Selenium + AWS: Deep in Docker Hell

Rstudio + Selenium + AWS: Deep in Docker Hell

As with most data scientist, there comes a time in your life when you have enough false confidence that you try to build production systems using docker on AWS. This past weekend, I fell in this trap. Having recently attended a R-ladies event in Cape Town that dealt with the topic of Docker for Data Science, I achieved a...

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2018 R Conferences

May 10, 2018
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2018 R Conferences

rstudio::conf 2018 and the New York R Conference are both behind us, but we are rushing headlong into the season for conferences focused on the R Language and its applications. The European R Users Meeting (eRum) begins this coming Monday, May 14th, in Budapest with three days of workshops and talks. Headlined by R Core member Martin Mächler and fellow...

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the riddle of the stands

May 10, 2018
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the riddle of the stands

The simple riddle of last week on The Riddler, about the minimum number of urinals needed for n men to pee if the occupation rule is to stay as far as possible from anyone there and never to stand next to another man,  is quickly solved by an R code: ocupee=function(M){ ok=rep(0,M) ok=ok=1 ok=1 while

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