July 2018

with( )

July 20, 2018 | kaijagahm

Problem Making graphics with base R is annoying for many reasons, but a big one is having to type the name of the data frame over and over again to reference different columns. Context Back to our Mississippi River fish data. I’ve aggregated my sampling points into polygons, and ...
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A hex sticker wall, created with R

July 20, 2018 | David Smith

Bill Venables, member of the R Foundation, co-author of the Introduction to R manual, R package developer, and one of the smartest and nicest (a rare combo!) people you will ever meet, received some gifts from the user!2018 conference committee in recognition of his longtime service to the R community. ... [Read more...]

Fighting Factors with Cats: Exercises

July 20, 2018 | sindri

  In this exercise set, we will practice using the forcats factor manipulation package by Hadley Wickham. In the last exercise set, we saw that it is entirely possible to deal with factors in base R,  but also that things can get a bit involved and un-intuitive. Forcats simplifies many common ...
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Benchmarking Feature Selection Algorithms with Xy()

July 20, 2018 | André Bleier

Feature Selection Feature Selection is one of the most interesting fields in machine learning in my opinion. It is a boundary point of two different perspectives on machine learning – performance and inference. From a performance point of view, feature selection is typically used to increase the model performance or to ...
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CVXR: A Direct Standardization Example

July 19, 2018 | R Views

In our first blog post, we introduced CVXR, an R package for disciplined convex optimization, and showed how to model and solve a non-negative least squares problem using its interface. This time, we will tackle a non-parametric estimation example, which features new atoms as well as more complex constraints. Direct ...
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Whether to use a data frame in R?

July 19, 2018 | Florian Privé

In this post, I try to show you in which situations using a data frame is appropriate, and in which it’s not. Learn more with the Advanced R book. What is a data frame? A data frame is just a list of vectors of the same length, each vector ... [Read more...]

The end of errors in ANOVA reporting

July 19, 2018 | Dominique Makowski

Fit an anova APA formatted output Correlations, t-tests, regressions… Evolution Credits On similar topics Psychology is still (unfortunately) massively using analysis of variance (ANOVA). Despite its relative simplicity, I am very often confronted to errors in its reporting, for instance in student’s theses or manuscripts. Beyond the incomplete, uncomprehensible ... [Read more...]

Le Monde puzzle [#1061]

July 19, 2018 | xi'an

A griddy Le Monde mathematical puzzle: On a 4×5 regular grid, find how many nodes need to be turned on to see all 3×4 squares to have at least one active corner in case of one arbitrary node failing.  Repeat for a 7×9 grid. The question is open to simulated annealing, as in ...
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EARL US Roadshow 2018 – agenda announced

July 19, 2018 | Laura Swales

We are delighted to announce that the full EARL US Roadshow agendas are now available! Each city has a different line-up of world-class speakers and R experts for you to explore. EARL focuses on the business application of R and will showcase many fascinating and inspiring use cases from a ... [Read more...]

Basic Generalised Linear Modelling – Part 1: Exercises

July 18, 2018 | Hanif Kusuma

A generalized linear model (GLM) is a flexible generalization of an ordinary linear regression that allows for response variables that have error distribution models other than a normal distribution. The GLM generalizes linear regression by allowing the linear model to be related to the response variable via a link function ... [Read more...]

nanotime 0.2.2

July 18, 2018 | Thinking inside the box

A new maintenance release of the nanotime package for working with nanosecond timestamps just arrived on CRAN. nanotime uses the RcppCCTZ package for (efficient) high(er) resolution time parsing and formatting up to nanosecond resolution, and the bit64 package for the actual integer64 arithmetic. Initially implemented using the S3 system, ... [Read more...]
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