Agreement between a web collaborative dataset and an administrative dataset to assess the retail food environment in Mexico

Table 3 Cross classification by tertiles of food outlets between Google data and DENUE, 2021

Density of food outlets (counts/km²)	n	Correctly classified (%)^a	Misclassified (Google data underestimates) (%)^b	Misclassified (Google data overestimates) (%)^c	Weighted kappa (SE)
Total census tracts	1693	70.1	14.4	15.5	0.64 (0.02)
Hermosillo, Sonora	662	67.5	16.2	16.3	0.60 (0.03)
Leon, Guanajuato	687	74.5	12.2	13.2	0.70 (0.03)
Tlalpan, Mexico City	203	71.4	14.3	14.3	0.68 (0.06)
Oaxaca de Juarez, Oaxaca	141	61.7	19.1	19.1	0.54 (0.07)

DENUE National Statistical Directory of Economic Units, SE Standard Error
^aCorrectly classified = % of census tracts with density of food outlets of DENUE and Google data in the same tertile
^bMisclassified (Google data underestimates) = % of census tracts adjacently or extreme opposite tertile classified when Google data underestimates
^cMisclassified (Google data overestimates) = % of census tracts adjacently or extreme opposite tertile classified when Google data overestimates

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