John Helveston

splitKbCompare. An interactive tool for comparing layouts of different split mechanical keyboards

renderthis. An R package for building xaringan slides into multiple outputs, including html, pdf, png, gif, pptx, and mp4.

logitr. Fast estimation of multinomial (MNL) and mixed logit (MXL) models in R with "Preference" space or "Willingness-to-pay" (WTP) space utility parameterizations in R

wireless-corne. Build log and photo gallery for my Wireless Corne keyboard

distillery. A distill blog and showcase about building distill websites and blogs!

stanTuneR. This code uses the algebra solver in Stan (https://mc-stan.org/) to find the parameters of a distribution that produce a desired tail behavior.

kyria_3d_cases.

kyria. Files related to the Kyria keyboard.

jhelvy_quarto. Source files for my personal website, built using Quarto and deployed with Netlify

qmkJsonConverter. R code to convert the .json file from the QMK configurator into a keymap.c file

jKeyboard. Files for creating my custom keyboard, including my Karabiner-Elements settings and WASD Keyboard layout files

cbcTools. R package of comprehensive tools for designing and analyzing choice-based conjoint (cbc) experiments

cv. My CV, generated using R, Quarto, and a Googlesheet

formr4conjoint. A simple demo of using formr.org to create a choice-based conjoint survey

jhelvy_distill. Source files for my personal website, built using the {distill} R package and deployed with netlify

lexis. A theme for xaringan slides

jph. A bunch of useful functions for working in R

mlogitCars. An example of estimating choice models in R using the mlogit package

solar-learning-2021. This repository contains the data and code to reproduce results from our study titled "Quantifying the cost savings of global solar photovoltaic supply chains". The link below is to an app to assess the sensitivity of our study outcomes to different modeling assumptions.

charts. A repo of reproducible charts

iris-rev2. Build log of my Iris keyboard (a.k.a. the "Altoids Can")

potus-econ-scorecard. JavaScript

renderthistemp. Render slides and other media into different formats

magaScreener. Document screening tool for identifying MAGA-targeted keywords

2025-surveydown-workshop. Workshop on using surveydown to build surveys

2025-posit-conf-surveydown. Slides for my talk on surveydown at the 2025 posit::conf

maddTools. An R package of functions for the GWU course EMSE 6035: Marketing Analytics for Design Decisions

zmk-config-corne.

surveys-with-formr. Files for my rstudio::conf 2021 lightning talk: "Using formr to create R-powered surveys with individualized feedback"

coding-with-ai.

p4a. Source code for my book "Programming for Analytics in R"

stories-with-data. Workshop on telling stories with data

conjointTools. An R package with tools for designing choice based conjoint (cbc) survey experiments and conduction power analyses

2023-qux-conf-conjoint. Content for my workshop at the 2023 Quant UX Conference on Open Source Conjoint in R

gglabelr. Interactive shiny app to create labels on ggplot

scraperToolkit. Toolkit for webscraping in R and Python

tra2015. Raw data and replication of results from our 2015 publication in Transportation Research Part A

smartcharging. HTML

factorlock. Set factors levels based on row order

jhelvy.github.io. HTML

carsheet. Webscraping of the data at carsheet.io

demo_quarto_website. CSS