jhelvy / 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.

Hello! 👋

My name is John Paul Helveston and I am an Assistant Professor in EMSE @ GWU. On GitHub you'll usually see me contributing to research projects, R packages, courses I develop / teach, or other fun side projects. I speak English, Chinese, R (base + tidyverse), and Python fluently as well as some moderate CSS and HTML. 😄

Links

• Personal Website
• Twitter
• Mastodon
• Linkedin
• Research Gate
• Google Scholar
• orcID

Research Projects

Each of these repositories contain the data and code to reproduce analyses for research projects:

• pev-resale-2024: Replication code for our 2024 paper “Battery-Powered Bargains? Assessing Electric Vehicle Resale Value in the United States” Environmental Research Letters. DOI: 10.1088/1748-9326/ad3fce
• vmt-2023: Replication code for our 2023 paper "Quantifying electric vehicle mileage in the United States." Joule. DOI: 10.1016/j.joule.2023.09.015
• solar-learning-2021: Replication for our 2022 paper "Quantifying the cost savings of global solar photovoltaic supply chains." Nature. DOI: 10.1038/s41586-022-05316-6
• pev-incentives-2021: Replication for our 2022 paper "Not all subsidies are equal: Measuring preferences for electric vehicle financial incentives.” Environmental Research Letters. DOI: 10.1088/1748-9326/ac7df3
• dcTravelSurvey: A conjoint survey about user trip travel preferences in the DC Metro Area conducted at George Washington University.
• pev-experience-2019: Replication for our 2020 paper "Electric vehicle adoption: can short experiences lead to big change?,” Environmental Research Letters. 15(0940c3). DOI: 10.1088/1748-9326/aba715
• tra2015: Replication for our 2015 paper "Will subsidies drive electric vehicle adoption? Measuring consumer preferences in the U.S. and China" Transportation Research Part A: Policy and Practice, 73, 96–112. DOI: 10.1016/j.tra.2015.01.002

R Packages

• logitr: logitr: Fast Estimation of Multinomial and Mixed Logit Models with Preference Space and Willingness to Pay Space Utility Parameterizations utility parameterizations. Accomanying JSS article here: DOI: 10.18637/jss.v105.i10
• cbcTools: An R package with tools for designing choice based conjoint (cbc) survey experiments and conduction power analyses.
• renderthis: Package for rendering media (e.g., xaringan slides) into multiple different formats. Co-authored with Garrick Aden-Buie.
• surveydown: An attempt to build a markdown-based survey platform using Quarto & Shiny. This is a work in progress and is not yet formatting into a formal package.

Open Source Courses

• EMSE 4571: Intro to Programming for Analytics: A course on the fundamentals of programming and computational thinking in R.
• EMSE 4572: Exploratory Data Analysis: A course on the foundations in exploring and visualizing data in R.
• EMSE 6035: Marketing Analytics for Design Decisions: A course on analyzing consumer choice data in R to inform design decisions in an uncertain, competitive, market.
• R for Analytics Primer: A self-guided tutorial for developing a foundation in programming in R for data analysis, including data input/output, data wrangling, and data visualization using the Tidyverse.

Community

• GW Coders: A community organization co-founded by myself and Ryan Watkins that brings together students and faculty to apply computational and data analytics skills in research.
• The Distillery: A distill blog and showcase about building distill websites and blogs.

Keyboards

• splitKbCompare: An interactive tool for comparing layouts of different split mechanical keyboards.
• Wireless Corne: Build log and photo gallery for my Wireless Corne keyboard.
• Iris Rev 2: Build log and photo gallery for my Iris Rev 2 keyboard.