LQ is the ratio of (Land use category "i" in a census tract / total land use in census track) to (Land use category "i" in the zonal area / Total land use zonal area). For example census track A has 10 acres of corn, 90 acres of agriculture area; and 30 acres of corn in the zonal region, and 150 acres of agricultural area. the LQ would be (10/90)/(30/150) = 0.55 or corn acreage in census track "A" is less than what was expected.
