Case Studies
Representative projects across quantitative and qualitative research. Client details anonymized.
Quantitative Research
Urban–Rural Disparities in HIV Care Access
Data: Medicaid MAX/PC (2009–2012), AIDSVu, AHRF · Population: 49,596 people living with HIV.
Approach: Geospatial network analysis of one‑way drive time from enrollee ZIP centroids to clinician practice locations with sensitivity analyses across rurality definitions, specialties, and states; covariate adjustment at individual and county levels.
Impact: Rural median drive time 43.6 minutes vs 11.9 minutes urban (p < 0.0001); 38% of rural members traveled over one hour—evidence used to prioritize transportation and clinic placement.
mRNA COVID‑19 Vaccine Effectiveness in Cirrhosis
Data: VOCAL cohort of U.S. veterans with cirrhosis · Design: Retrospective cohort with propensity‑matched vaccinated vs. unvaccinated groups.
Approach: 20,037 vaccine recipients matched to 20,037 controls on baseline factors; baseline labs harmonized within 90 days; propensity weighting and time‑to‑event models; comparison of BNT162b2 vs mRNA‑1273.
Impact: 64.8% infection reduction after dose 1 and 78.6% after dose 2; 100% protection against hospitalization or death within seven days of the second dose.
Qualitative Research
Content Analysis of Online Recipes
Data: 207 recipes and 2,818 comments from a social platform, collected via fresh accounts with no search history.
Approach: Codebook‑driven content analysis with high inter‑rater agreement (raw agreement ≈ 0.97); extracted nutrition profiles by primary ingredient.
Findings: Seafood/vegetable‑based recipes had fewer calories and less sodium, sugar, and cholesterol than meat/poultry recipes; popularity skewed toward higher‑calorie items.
NLP Sentiment on Taste vs. Health
Data: Comment corpus from the same recipe dataset.
Approach: Natural language processing sentiment analysis to quantify user emphasis on taste, complexity, and health attributes.
Findings: Users weighted taste more heavily than complexity and health, explaining engagement patterns inconsistent with nutrition quality.
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