Articles by Higher Order Functions

Ridgelines in bayesplot 1.5.0

April 2, 2018 | Higher Order Functions

At the end of March, Jonah Gabry and I released bayesplot 1.5.0. The major additions to the package were visualizations using ridgelines and a new plot for PIT diagnostics from LOO validation. I don’t know what that LOO PIT thing is yet, so I’ll ta...

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Recode values with character subsetting

January 9, 2018 | Higher Order Functions

Do you ever have to recode many values at once? It’s a frequent chore when preparing data. For example, suppose we had to replace state abbreviations with the full names: abbs [Read more...]

Using nonstandard evaluation to simulate a register machine

January 5, 2018 | Higher Order Functions

I recently completed all 25 days of Advent of Code 2017, an annual series of recreational programming puzzles. Each day describes a programming puzzle and illustrates a handful of simple examples of the problem. The puzzle then requires the participant to solve a much, much larger form of the problem. For five ... [Read more...]

Secret Santa is a graph traversal problem

November 28, 2017 | Higher Order Functions

Last week at Thanksgiving, my family drew names from a hat for our annual game of Secret Santa. Actually, it wasn’t a hat but you know what I mean. (Now that I think about it, I don’t think I’ve ever seen names drawn from a literal hat ... [Read more...]

Simplifying ggplot2 code by doing nothing

October 10, 2017 | Higher Order Functions

Recently, I joined the development team for bayesplot, an R package by the Stan team for plotting Bayesian models. Because visualizing Bayesian models in ggplot2 is a recurring topic here, it was a natural fit. So from time to time, I’ll post about some programming techniques and new features ...

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set_na_where(): a nonstandard evaluation use case

August 14, 2017 | Higher Order Functions

In this post, I describe a recent case where I used rlang’s tidy evaluation system to do some data-cleaning. This example is not particularly involved, but it demonstrates is a basic but powerful idea: That we can capture the expressions that a user...

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A tour of the tibble package

July 9, 2017 | Higher Order Functions

Dataframes are used in R to hold tabular data. Think of the prototypical spreadsheet or database table: a grid of data arranged into rows and columns. That’s a dataframe. The tibble R package provides a fresh take on dataframes to fix some longstan... [Read more...]

Plotting partial pooling in mixed-effects models

June 21, 2017 | Higher Order Functions

In this post, I demonstrate a few techniques for plotting information from a relatively simple mixed-effects model fit in R. These plots can help us develop intuitions about what these models are doing and what “partial pooling” means. The sleeps...

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New package polypoly (helper functions for orthogonal polynomials)

May 29, 2017 | Higher Order Functions

Last week, I released a new package called polypoly to CRAN. It wraps up some common tasks for dealing with orthogonal polynomials into a single package. The README shows off the main functionality, as well as the neat “logo” I made for the packag...

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I don’t know Fisher’s exact test, but I know Stan

May 15, 2017 | Higher Order Functions

A few days ago, I watched a terrific lecture by Bob Carpenter on Bayesian models. He started with a Bayesian approach to Fisher’s exact test. I had never heard of this classical procedure, so I was curious to play with the example. In this post, I use the same ...

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Simulating Unown encounter rates in Pokémon Go

March 21, 2017 | Higher Order Functions

Pokémon Go is an augmented reality game where people with smartphones walk around and catch Pokémon. As in the classic games, players are Pokémon “trainers” who have to travel around and collect creatures. Some types are rarer than others, som...

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Repeatedly applying a function

January 11, 2017 | Higher Order Functions

A colleague of mine sent me the following R question: I have a function that takes a list and does some stuff to it and then returns it. I then take that output and run it through the same function again. But I obviously don’t want to repeatedly ...

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RStanARM basics: visualizing uncertainty in linear regression

November 18, 2016 | Higher Order Functions

As part of my tutorial talk on RStanARM, I presented some examples of how to visualize the uncertainty in Bayesian linear regression models. This post is an expanded demonstration of the approaches I presented in that tutorial. Data: Does brain mass predict how much mammals sleep in a day? Let’...

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Recent adventures with lazyeval

August 14, 2016 | Higher Order Functions

The lazyeval package is a tool-set for performing nonstandard evaluation in R. Nonstandard evaluation refers to any situation where something special happens with how user input or code is evaluated. For example, the library function doesn’t evalua...

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Fixing APA citations from Pandoc with stringr

August 3, 2016 | Higher Order Functions

Pandoc is awesome. It’s the universal translator for plain-text documents. I especially like that it can do inline citations. I write @Jones2005 proved aliens exist and pandoc produces “Jones (2005) proved aliens exist”. But it doesn’t quite d... [Read more...]

Why is using list() critical for .dots = setNames() uses in dplyr?

March 22, 2016 | Higher Order Functions

I wrote an answer about why setNames() shows up sometimes in standard evaluation with dplyr. My explanation turned into a mini-tutorial on why those standard evaluation functions have a .dots argument. The basic idea is that the usual variadic argume... [Read more...]

Confusion matrix statistics on late talker diagnoses

October 5, 2015 | Higher Order Functions

How many late talkers are just late bloomers? More precisely, how many children identified as late talkers at 18 months catch up to the normal range by one year later? This is an important question. From a clinical perspective, we want to support children with language delays, but it is also ... [Read more...]

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Articles by Higher Order Functions

Ridgelines in bayesplot 1.5.0

Recode values with character subsetting

Using nonstandard evaluation to simulate a register machine

Secret Santa is a graph traversal problem

Simplifying ggplot2 code by doing nothing

set_na_where(): a nonstandard evaluation use case

A tour of the tibble package

Plotting partial pooling in mixed-effects models

New package polypoly (helper functions for orthogonal polynomials)

I don’t know Fisher’s exact test, but I know Stan

Simulating Unown encounter rates in Pokémon Go

Repeatedly applying a function

RStanARM basics: visualizing uncertainty in linear regression

Recent adventures with lazyeval

Fixing APA citations from Pandoc with stringr

Why is using list() critical for .dots = setNames() uses in dplyr?

Confusion matrix statistics on late talker diagnoses

Articles by Higher Order Functions

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