CUPED and CUPAC in Practice: Variance Reduction for A/B Tests (with R Code)
A practical guide to CUPED and CUPAC, with intuition, pitfalls, and an end-to-end R implementation you can reuse.

Ph.D. Candidate, Quantitative Marketing
Emory University
AI & Digital Platforms • Causal Inference • Marketplace Design
Atlanta, GA · fnguyen.netlify.app · GitHub · LinkedIn
I am a Ph.D. candidate in Quantitative Marketing at Emory University. I study AI and digital platforms, online communities, and algorithmic governance using quasi-experiments and scalable measurement from multimodal data.
Research interests: AI & digital platforms; online communities; information design; digital marketing; responsible AI.
Methods: Causal Inference - DiD/RD/IV, experiments, debiased ML, deep learning, foundation models.
Emory University
Ph.D. Candidate, Quantitative Marketing (Expected 2026)
Advisor: David Schweidel
University of Wisconsin–Madison
MBA & M.S., Business Analytics (2020)
Foreign Trade University
B.S., Economics (2015)
Job Market Paper
Phuc Hung Nguyen · David Schweidel
Under review
We develop a multimodal representation-learning pipeline to measure content strategy at scale using 5M Instagram posts. Engagement exhibits an inverted-U relationship with diversification, and differentiation benefits smaller creators most. An instrumental-variables design supports a causal interpretation.
---
title: ""
page-layout: article
toc: false
listing:
id: latest-posts
contents: "posts/*/index.qmd"
sort: "date desc"
type: grid
max-items: 3
grid-columns: 3
fields: [date, title, description]
date-format: "medium"
sort-ui: false
filter-ui: false
---
::: {.columns .align-items-center .hero-columns}
::: {.column width="33%"}
{fig-alt="Felicia Nguyen" width="260"}
:::
::: {.column width="67%" .ps-md-4}
# Felicia Nguyen {.mb-1}
::: hero-subtitle
Ph.D. Candidate, Quantitative Marketing\
**Emory University**\
*AI & Digital Platforms • Causal Inference • Marketplace Design*
:::
::: mt-3
<a class="btn btn-primary me-2" href="assets/PhucHungNguyen_CV.pdf">Download CV</a> <a class="btn btn-outline-primary me-2" href="assets/PhucHungNguyen_Resume.pdf">Download Resume</a> <a class="btn btn-outline-secondary" href="mailto:pnguy38@emory.edu">Email</a>
:::
::: {.inline-meta .mt-3}
Atlanta, GA · <a href="https://fnguyen.netlify.app">fnguyen.netlify.app</a> · <a href="https://github.com/fphng">GitHub</a> · <a href="https://www.linkedin.com/in/phhung31">LinkedIn</a>
:::
:::
:::
::: {.grid .align-items-start .gap-4}
::: {.g-col-12 .g-col-md-7}
## Hiya, I'm Felicia 😸
I am a Ph.D. candidate in Quantitative Marketing at Emory University. I study AI and digital platforms, online communities, and algorithmic governance using quasi-experiments and scalable measurement from multimodal data.
**Research interests:** AI & digital platforms; online communities; information design; digital marketing; responsible AI.
**Methods:** Causal Inference - DiD/RD/IV, experiments, debiased ML, deep learning, foundation models.
:::
::: {.g-col-12 .g-col-md-5}
## Education
**Emory University**
Ph.D. Candidate, Quantitative Marketing *(Expected 2026)*
Advisor: David Schweidel
**University of Wisconsin–Madison**
MBA & M.S., Business Analytics *(2020)*
**Foreign Trade University**
B.S., Economics *(2015)*
:::
:::
## Selected papers
::: {.card .mb-3}
::: card-body
[Job Market Paper]{.badge .text-bg-primary}
::: {.paper-title .mt-2}
<a href="research.qmd#jmp-variety-uniqueness">Variety and Uniqueness in Online Content: A Multimodal Representation Learning Approach</a>
:::
::: paper-authors
Phuc Hung Nguyen · David Schweidel
:::
::: paper-status
Under review
:::
::: {.paper-abstract .mt-2}
We develop a multimodal representation-learning pipeline to measure content strategy at scale using 5M Instagram posts. Engagement exhibits an inverted-U relationship with diversification, and differentiation benefits smaller creators most. An instrumental-variables design supports a causal interpretation.
:::
:::
:::
::: columns
::: {.column width="50%"}
### Working papers
- [Selling Certainty, Buying Entry: The Causal Effect of a “No Reserve” Label in Online Auctions](research.qmd#wp-no-reserve) *(R&R at Management Science)*
- [Beyond Likes: The Impact of Engagement Signal Obfuscation](research.qmd#wp-beyond-likes) *(Working paper)*
- [Moderation Strategy and Expertise Signaling in an Online Health Consultation Community](research.qmd#wp-askdocs) *(Working paper)*
:::
::: {.column width="50%"}
### Publications & proceedings
- <a href="https://anng217.github.io/">Nguyen, An</a> ; Nguyen, Phuc Hung. “Innovation Cascades: Amazon Headquarters 2's Impact on Local Innovation Activities.” *PACIS Proceedings* (2024). [Details](publications.qmd#pacis-2024)
:::
:::
## Latest posts
::: {#latest-posts}
:::
[All posts →](posts.qmd)
## Current status
- **Expected graduation:** 2026\
- **Primary affiliation:** Emory University (Goizueta Business School)\
- **Open to:** research collaborations and data-driven roles in experimentation/causal inference, marketplaces, and platform product analytics