Monthly Archives: April 2019

Dealing with correlation in designed field experiments: part I

Observations are grouped When we have recorded two traits in different subjects, we can be interested in describing their joint variability, by using the Pearson’s correlation coefficient. That’s ok, altough we have to respect some basic assumptions (e.g. linearity) that have been detailed elsewhere (see here). Problems may arise when we need to test the hypothesis that the correlation coefficient is...

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Analysing the HIV pandemic, Part 1: HIV in sub-Sahara Africa

April 29, 2019
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Analysing the HIV pandemic, Part 1: HIV in sub-Sahara Africa

Phillip (Armand) Bester is a medical scientist, researcher, and lecturer at the Division of Virology, University of the Free State, and National Health Laboratory Service (NHLS), Bloemfontein, South Africa Sabeehah Vawda is a pathologist, researcher, and lecturer at the Division of Virology, University of the Free State, and National Health Laboratory Service (NHLS), Bloemfontein, South Africa Andrie de Vries is the...

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RStudio 1.2 Released

April 29, 2019
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RStudio 1.2 Released

We're excited to announce the official release of RStudio 1.2! What’s new in RStudio 1.2? Over a year in the making, this new release of RStudio includes dozens of new productivity enhancements and capabilities. You’ll now find RStudio a more comfortable workbench for working in SQL, Stan, Python, and D3. Testing your R code is easier, too, with integrations for shinytest...

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ViennaR Meetup March – Full Talks Online

April 29, 2019
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The full talks of the ViennaR March Meetup are finally online: A short Introduction to ViennaR, Laura Vana introducing R-Ladies Vienna and Hadley Wickham with a great introduction to tidy(er) data and the new functions pivot_wider() and pivot_longer...

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Relaunching the qualtRics package

April 29, 2019
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Note: cross-posted with the rOpenSci blog. rOpenSci is one of the first organizations in the R community I ever interacted with, when I participated in the 2016 rOpenSci unconf. I have since reviewed several rOpenSci packages and been so happy to be co...

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Relaunching the qualtRics package

rOpenSci is one of the first organizations in the R community I ever interacted with, when I participated in the 2016 rOpenSci unconf. I have since reviewed several rOpenSci packages and been so happy to be connected to this community, but I have never submitted or maintained a package myself. All that changed when I heard the call for...

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What matters more in a cluster randomized trial: number or size?

April 29, 2019
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What matters more in a cluster randomized trial: number or size?

I am involved with a trial of an intervention designed to prevent full-blown opioid use disorder for patients who may have an incipient opioid use problem. Given the nature of the intervention, it was clear the only feasible way to conduct this particular study is to randomize at the physician rather than the patient level. There was a concern that...

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Compute R2s and other performance indices for all your models!

April 29, 2019
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Compute R2s and other performance indices for all your models!

Indices of model performance (i.e., model quality, goodness of fit, predictive accuracy etc.) are very important, both for model comparison and model description purposes. However, their computation or extraction for a wide variety of models can be complex. To address this, please let us introduce the performance package! performance We have recently decided to collaborate around the new easystats project, a...

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Marketing with Machine Learning: Apriori

April 29, 2019
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Marketing with Machine Learning: Apriori

This is part 1 of an ongoing series, introduced in Detroit Data Lab Presents: Marketing with Machine Learning Introduction Apriori, from the latin “a priori” means “from the earlier.” As with many of our predictions, we’re learning from the past and applying it toward the future. It’s the “Hello World” of marketing with machine learning! … Continue reading Marketing...

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runcharter

April 29, 2019
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A thing what I built - Waffle I didn’t write a blog post in March, because I was busy doing other stuff, but it turns out no one noticed, or maybe they did, and simply didn’t care. Well, I care, because it brought my streak of 20 success...

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