Trends Gazelle 2021

February 16, 2021 | Open Analytics

Open Analytics nominated as a Trends Gazelle 2021 The ‘Trends Gazelles’ is an annual award organised by the leading Belgian financial and economic news magazine Trends. The nomination was not sought. It fell in our letter box. No slick sal... [Read more...]

Make Your R Package Easier to Cite

February 15, 2021 | rOpenSci - open tools for open science

Scientists rarely cite research software they use as part of a research project. As a consequence, the software and the time spent developing and maintaining it becomes an invisible scholarly contribution. Furthermore, this lack of visibility means that incentives to produce high quality, sustainable software are missing. Among many reasons ... [Read more...]

Testing The Equality of Regression Coefficients

February 15, 2021 | R on I Should Be Writing: COVID-19 Edition

The Problem Method 1: As Model Comparisons Method 2: Paternoster et al (1998) Method 3: emmeans \beta_{\text{n_comps}}\). Method 2: Paternoster et al (1998) According to Paternoster et al. (1998), we can compute a t-test to compare the coefficients:
bs <- coef(m)[-1]
V <- vcov(m)[-1, -1]

tibble::tibble(
  diff_estim = diff(bs),
  diff_SE = sqrt(V[1, 1] + V[2, 2] - 2 * V[1, 2]),
  t_stat = diff_estim / diff_SE,
  df = df.residual(m),
  p_value = 2 * pt(abs(t_stat), df = df, lower.tail = FALSE)
)
#> # A tibble: 1 x 5
#>   diff_estim diff_SE t_stat    df  p_value
#>        <dbl>   <dbl>  <dbl> <int>    <dbl>
#> 1     -0.402  0.0251  -16.0   497 6.96e-47
This gives the exact same results as the first method! (\(t^2 = (-16)^2 = 256\) is the ... [Read more...]

Image sizes in an R markdown Document

February 15, 2021 | The Jumping Rivers Blog

At Jumping Rivers we recently moved our website from WordPress to Hugo. The main reason for the move was that since the team are all very comfortable with Git, continuous integration and continuous development using a static web-site generator made more sense than WordPress. Additional benefits are decreasing the page ...
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R Package Tracking

February 15, 2021 | Gary Hutson

I have recently uploaded my first R package to the CRAN repository, it needs an additional revision, but it is now there. I wanted to know how many downloads it has had since its release on CRAN last month. I thought shall I write a package, but alas there is ...
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Map my run in R

February 14, 2021 | R on Jason Bryer

First, I want to give a plug to the RStats Strava Running Club. If you are into running, it is a great group that provides lots of support. This post is inspired by this streetmaps tutorial over at ggplot2tutor.com on creating map artwork/posters. ... [Read more...]

R Interface for MiniZinc

February 14, 2021 | R Views

Akshit Achara is a medical device engineer and computer science enthusiast based in Bengaluru, Karnataka, India. You can connect with Akshit on LinkedIn. Introduction Constraint programming is a paradigm for solving combinatorial problems that draws on a wide range of techniques from artificial intelligence, computer science, and operations research. MiniZinc ... [Read more...]
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