Website · Talks · Papers · sgp.io · Center for Assessment
I work on how we describe student learning over time. I developed the student growth percentile (SGP) methodology, and I maintain the open-source R packages that states use to calculate and report student growth. At the Center for Assessment I work with state education agencies on growth and accountability systems, technical advisory committees, and on reporting results so that educators and the public can use them.
- Longitudinal inference without longitudinal data. A copula-based framework that recovers growth from cross-sectional assessment data, and brings TAMP and SGP under one roof.
- Measurement as an AI-native profession. How assessment work changes when AI is part of every step, from analysis to the dissertation. I built dataimago, the design system and R tooling behind my recent sites and decks, along the way.
- Growth in practice. Annual SGP analyses and reporting with states, and how English-learner exit decisions relate to growth.
| Package | What it does | |
|---|---|---|
| SGP | Student growth percentiles and percentile growth projections and trajectories |  |
| SGPdata | Exemplar longitudinal data sets for SGP |  |
| SGPstateData | The state-level metadata SGP runs on: cut scores, knots and boundaries, norm-group preferences | GitHub |
| sgpFlow | Growth trajectories and student flow from SGP coefficient matrices | GitHub |
| randomNames | Random gender- and ethnicity-specific names |  |
| toOrdinal | Ordinal numbers and dates in several languages |  |
 Student Growth: The Pulse of the Education System DoWEA Fall Leadership Meeting · Oct 26, 2026 |
 New Hampshire 2026 SGP Results New Hampshire Technical Advisory Committee · Oct 19, 2026 |
 Educational Measurement as an AI-Native Profession AIME-Con 2026, Pittsburgh · Oct 7, 2026 |
- Writing an AI-Native Dissertation — AIME-Con 2026, Pittsburgh, Oct 2026
- Rhode Island 2026 SGP Analyses — Rhode Island Technical Advisory Committee, Aug 27, 2026
- Longitudinal Insight from Cross-Sectional Assessments — IEA Research & Development, Aug 18, 2026
- What Am I Actually Doing? — Center for Assessment staff retreat (brown-bag), Jul 15, 2026
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from the catalog behind my website, and a weekly workflow keeps them current.