StanCon 2018 Highlights

January 23, 2018
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StanCon 2018 Highlights

Highlights from StanCon 2018 This year we had the privelage of sponsoring StanCon. Unfortunately, we weren’t able to actually attend the conference. Rather than let our ticket go to waste, we ran a small competition, which Ignacio Martinez won ...

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Le Monde puzzle [#1037]

January 23, 2018
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Le Monde puzzle [#1037]

A purely geometric Le Monde mathematical puzzle this (or two independent ones, rather): Find whether or not there are inscribed and circumscribed circles to a convex polygon with 2018...

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Visualize your Strava routes with R

January 23, 2018
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Visualize your Strava routes with R

Strava is a fitness app that records you activities, including the routes of your walks, rides and runs. The service also provides an API that allows you to extract...

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Tidyverse and data.table, sitting side by side… and then base R walks in

January 23, 2018
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Of course, I’m paraphrasing Dirk’s fifteenth post in the rarely rational R rambling series: #15: Tidyverse and data.table, sitting side by side … (Part 1). I very much liked it, because, although...

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The progress bar just got a lot cheaper

January 23, 2018
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The pbapply R package that adds progress bar to vectorized functions has been know to accumulate overhead when calling parallel::mclapply with forking (see this post for more background on...

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Get insights of Instacart Market Basket

January 22, 2018
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Get insights of Instacart Market Basket

Introduction Services that deliver the ingredients and recipes you need to make fresh, home-cooked meals, like Instacart have grown in popularity as people are turning away from low-cost, fast...

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A guide to GPU-accelerated ships recognition in satellite imagery using Keras and R (part II)

January 22, 2018
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A guide to GPU-accelerated ships recognition in satellite imagery using Keras and R (part II)

Before we start… We hope you found the first half of this post useful and interesting. Before we dive into the code, I want to explain a few important aspects...

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Understanding Naïve Bayes Classifier Using R

January 22, 2018
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The Best Algorithms are the Simplest The field of data science has progressed from simple linear regression models to complex ensembling techniques but the most preferred models are still...

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Exploring handwritten digit classification: a tidy analysis of the MNIST dataset

January 22, 2018
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Exploring handwritten digit classification: a tidy analysis of the MNIST dataset

In a recent post, I offered a definition of the distinction between data science and machine learning: that data science is focused on extracting insights, while machine learning is...

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Automating Basic EDA

January 22, 2018
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Automating Basic EDA

In any model development exercise, a considerable amount of time is spent in understanding the underlying data, visualizing relationships and validating preliminary hypothesis (broadly categorized as Exploratory data Analysis)....

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Rblpapi 0.3.8: Strictly maintenance

January 22, 2018
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Another Rblpapi release, now at version 0.3.8, arrived on CRAN yesterday. Rblpapi provides a direct interface between R and the Bloomberg Terminal via the C++ API provided by...

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How to recruit data analysts for the public sector by @ellis2013nz

January 22, 2018
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How to recruit data analysts for the public sector by @ellis2013nz

A management challenge Between 2011 and 2017 I selected somewhere between 20 and 30 staff and contractors, for New Zealand public sector roles with titles like Analyst, Senior Analyst and...

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Major update to BatchGetSymbols

January 22, 2018
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Making it even easier to download and organize stock prices from Yahoo Finance - ...

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Fatal Journeys: Visualizing the Horror

January 22, 2018
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In war, truth is the first casualty (Aeschylus) I am not a pessimistic person. On the contrary, I always try to look at the bright side of life. I...

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Predicting Conflict Duration with (gg)plots using Keras

January 21, 2018
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Predicting Conflict Duration with (gg)plots using Keras

An Unlikely Pairing Last week, Marc Cohen from Google Cloud was on campus to give a hands-on workshop on image classification using TensorFlow. Consequently, I spent most of my time...

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Wrapping Access to Web-Services in R-functions.

January 21, 2018
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Wrapping Access to Web-Services in R-functions.

One of the great features of R is the possibility to quickly access web-services. While some companies have the habit and policy to document their APIs, there is still...

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#15: Tidyverse and data.table, sitting side by side … (Part 1)

January 21, 2018
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#15: Tidyverse and data.table, sitting side by side … (Part 1)

Welcome to the fifteenth post in the rarely rational R rambling series, or R4 for short. There are two posts I have been meaning to get out for a...

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Advisory on Multiple Assignment dplyr::mutate() on Databases

January 21, 2018
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Advisory on Multiple Assignment dplyr::mutate() on Databases

I currently advise R dplyr users to take care when using multiple assignment dplyr::mutate() commands on databases. (image: Kingroyos, Creative Commons Attribution-Share Alike 3.0 Unported License) In this note...

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ggplot2 Time Series Heatmaps: revisited in the tidyverse

January 21, 2018
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ggplot2 Time Series Heatmaps: revisited in the tidyverse

I revisited my previous post on creating beautiful time series calendar heatmaps in ggplot, moving the code into the tidyverse. To obtain following example:Simply use the following code: I...

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R Weekly Bulletin Vol – XIV

January 20, 2018
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R Weekly Bulletin Vol – XIV

This week’s R bulletin covers some interesting ways to list functions, to list files and illustrates the use of double colon operator. Hope you like this R weekly bulletin....

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Who wants to work at Google?

January 20, 2018
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Who wants to work at Google?

In this tutorial, we will explore the open roles at Google, and try to see what common attributes Google is looking for, in future employees. This dataset is a...

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Rcpp 0.12.15: Numerous tweaks and enhancements

January 20, 2018
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The fifteenth release in the 0.12.* series of Rcpp landed on CRAN today after just a few days of gestation in incoming/. This release follows the 0.12.0 release from July...

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Winter solstice challenge #3: the winner is Bianca Kramer!

January 20, 2018
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Winter solstice challenge #3: the winner is Bianca Kramer!

Part of the winning submission in the category 'best tool'. A bit later than intended, but I am pleased to announce the winner of the Winter solstice challenge: Bianca Kramer! Of...

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Version 2.2.2 Released

January 19, 2018
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Version 2.2.2 Released

ggtern version 2.2.2 has just been submitted to CRAN, and it includes a number of new features. This time around, I have adapted the hexbin geometry (and stat), and...

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Data Driven DIY

January 19, 2018
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Data Driven DIY

Statisfix - Which fixing should I buy? I have a bathroom cabinet to put up. It needs to go onto a tiled plasterboard (drywall) wall. Because of...

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The Friday #rstats PuzzleR : 2018-01-19

January 19, 2018
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The Friday #rstats PuzzleR : 2018-01-19

Peter Meissner (@marvin_dpr) released crossword.r🔗 to CRAN today. It’s a spiffy package that makes it dead simple to generate crossword puzzles. He also made a super spiffy javascript library...

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Curb your imposterism, start meta-learning

January 19, 2018
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Recently, there has been a lot of attention for the imposter syndrome. Even seasoned programmers admit they suffer from feelings of anxiety and low self-esteem. Some share their personal...

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501 days of Summer (school)

January 19, 2018
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501 days of Summer (school)

As I anticipated earlier, we're now ready to open registration for our Summer School in Florence (I was waiting for UCL to set up the registration system and thought it...

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General Linear Models The Basics

January 18, 2018
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General Linear Models The Basics

General Linear Models: The Basics General linear models are one of the most widely used statistical tool in the biological sciences. This may be because they are so flexible and they can...

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