Data Quality
3 articles
The Data Quality Problem: How We Went From 49% to 12% Mobility Deserts
We found 49% of California census tracts were mobility deserts. After getting complete transit data, the corrected figure is 12%. Here's what went wrong—and how to avoid it.
400 Labels to 94% Accuracy: Validating Grocery Store Data
Google Places returned thousands of 'grocery stores.' Many weren't. Here's how a classifier separates real grocery stores from gas stations and liquor stores.
The Retail Density Paradox: Why More Stores Mean Worse Data
Developing a verification methodology for EBT acceptance across 7,000 California food retailers