Accuracy and repeatability of commercial geocoding

Eric A. Whitsel, Kathryn M. Rose, Joy L. Wood, Amenda C. Henley, Duanping Liao, Gerardo Heiss

Research output: Contribution to journalArticlepeer-review

101 Scopus citations


The authors estimated accuracy and repeatability of commercial geocoding to guide vendor selection in the Life Course Socioeconomic Status, Social Context and Cardiovascular Disease study (2001-2002). They submitted 1,032 participant addresses (97% in Maryland, Minnesota, Mississippi, or North Carolina) to vendor A twice over 9 months and measured repeatability as agreement between levels of address matching, discordance (%) between statistical tabulation areas, and median distance (d, in meters) and bearing (θ, in degrees) between coordinates assigned on each occasion (Hoi = 1 → ni/n] = 180°). They also submitted 75 addresses of nearby air pollution monitors (77% urban/suburban; 69% residential/commercial) to vendors A and B and then measured accuracy by comparing vendor- and US Environmental Protection Agency (EPA)-assigned geocodes using the above measures. Repeatability of geocodes assigned by vendor A was high (kappa = 0.90; census block group discordance = 5%; d < 1 m; θ = 177°). The match rate for EPA monitor addresses was higher for vendor B versus A (88% vs. 76%), but discordance at census block group, tract, and county levels also was, respectively, 1.4-, 1.9-, and 5.0-fold higher for vendor B. Moreover, coordinates assigned by vendor B were further from those assigned by the EPA (d = 212 m vs. 149 m; θ = 131° vs. 171°). These findings suggest that match rates, repeatability, and accuracy should be used to guide vendor selection.

Original languageEnglish (US)
Pages (from-to)1023-1029
Number of pages7
JournalAmerican journal of epidemiology
Issue number10
StatePublished - Nov 15 2004

All Science Journal Classification (ASJC) codes

  • Epidemiology


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