Accuracy and repeatability of commercial geocoding.
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 (theta;, in degrees) between coordinates assigned on each occasion (H(o):Sigma(i)( = 1 -->) (n) [theta;(i) /n] = 180 degrees ). 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; theta; = 177 degrees ). 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; theta; = 131 degrees vs. 171 degrees ). These findings suggest that match rates, repeatability, and accuracy should be used to guide vendor selection.
Whitsel
Eric A
EA
Department of Medicine, School of Medicine, University of North Carolina, Chapel Hill, NC 27514, USA. ewhitsel@email.unc.edu
Rose
Kathryn M
KM
Wood
Joy L
JL
Henley
Amanda C
AC
Liao
Duanping
D
Heiss
Gerardo
G
D000368:Aged; D000393:Air Pollutants / Q000600:supply & distribution*; D002318:Cardiovascular Diseases / Q000453:epidemiology; D004784:Environmental Monitoring / Q000379:methods* / Q000706:statistics & numerical data; D062665:Epidemiological Monitoring; D040362:Geographic Information Systems; D006801:Humans; D008875:Middle Aged; D015203:Reproducibility of Results; D012923:Social Class; D014481:United States / Q000453:epidemiology; D014484:United States Environmental Protection Agency
D000393:Air Pollutants