A little over a year ago, we decided to propose a data visualization course at the first-year level. We had been thinking about this for awhile, but never had the time to teach it given the scheduling constraints we had. … Continue reading → [Read more...]

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Idea Our colleagues over at the economics department became interested in using R/exams for generating large-scale exams in their introductory economics courses. However, they face the challenge that so far they had been writing static exercises and modified them by hand if they wanted to reuse them in a ... [Read more...]

Thanks to Paul Teetor, getSymbols() can now import data from Alpha Vantage!  This feature is part of the quantmod 0.4-11 release, and provides another another data source to avoid any Yahoo Finance API changes*.Alpha Vantage is a free web service that provides real-time and historical equity data.  They provide ... [Read more...]

I missed last week and almost forgot to add this week’s. Jonah Gabry returned from teaching a one-week course for a special EU research institute in Spain. Mitzi Morris has been knocking out bug fixes for the parser and some pull requests to refactor the underlying type inference to ... [Read more...]

I missed last week and almost forgot to add this week’s. Jonah Gabry returned from teaching a one-week course for a special EU research institute in Spain. Mitzi Morris has been knocking out bug fixes for the parser and some pull requests to refactor the underlying type inference to ... [Read more...]

Consider this tibble: vat_rates [Read more...]

The members of the R Ladies DC user group put together an R-themed crossword for a recent networking event. It's a fun way to test out your R knowledge. (Click to enlarge, or download a printable version here.) If you get stuck, you can find the answers here or at ... [Read more...]

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Election results are in The New Zealand Electoral Commission have released the final count of votes and seats from the 2017 election. Moving in the direction most sensible observers expected, the National Party lost two seats compared to the “on-th... [Read more...]

Here, in the spirit of my “Experiments with by_row()” post, are some experiments in writing and timing a function spread_to_list that converts a two-column tibble such as: x 1 y 2 z 3 t 4 to a named list: list( x=1, y=2, z=3, t=4 ) I need this for processing the parameter ... [Read more...]

A growing community of scientists from a variety of disciplines is moving the norms of scientific research toward open practices. Supporters of open science hope to increase the quality and efficiency of research by enabling the widespread sharing of datasets, research software source code, publications, and other processes and products ... [Read more...]

A growing community of scientists from a variety of disciplines is moving the norms of scientific research toward open practices. Supporters of open science hope to increase the quality and efficiency of research by enabling the widespread sharing of... [Read more...]

A growing community of scientists from a variety of disciplines is moving the norms of scientific research toward open practices. Supporters of open science hope to increase the quality and efficiency of research by enabling the widespread sharing of d... [Read more...]

It was recently brought to my attention by Hannah Frick that there are now sooo many R-Ladies chapters around the world! R-Ladies is a world-wide organization to promote gender diversity in the R community, and I’m very grateful to be part of this co... [Read more...]

Checking residual distributions for non-normal GLMs Quantile-quantile plots If you are fitting a linear regression with Gaussian (normally distributed) errors, then one of the standard checks is to make sure the residuals are approximately normally d... [Read more...]

In case you missed them, here are some articles from September of particular interest to R users. The mathpix package converts images of hand-drawn equations to their LaTeX equivalent. R 3.4.2 is released. Applying image featurization to the problem of classifying wood knots in lumber. Microsoft ML Server 9.2, which provides operationalization ... [Read more...]

This is a somewhat belated introduction of a package that we published on CRAN at the beginning of the year already, but I hadn’t found the time to blog about this earlier. In the R environment and beyond, a large number of packages exist that estimate posterior distributions via ... [Read more...]

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I’ve been pretty quiet on the blog front recently. That’s because I overhauled my site, migrating it to Hugo (the foundation of blogdown). Just doing one extra thing on top of my usual workload, I also did another thing. I wrote a book too! I’m a big ... [Read more...]