Changes between versions of the ADI, 7/14/2021

2019 ADI The 2019 ADI (v3.1) was constructed using the 2015-2019 5-year estimates from the US Census' American Community Survey. Suppression criteria was updated to use Population, Housing and Group Quarters estimates from the ACS in place of the decennial census. This adjusts the ADI of approximately 70 block groups nationally.

Changes between versions of the ADI, 6/1/2021

2019 ADI The 2019 ADI (v3.0) was constructed using the 2015-2019 5-year estimates from the US Census' American Community Survey. The methods include the suppression and imputation criteria initiated with the 2018 version (see entry dated 11/19/2020) and subsequently processed into the 2019 vintage.

Changes between versions of the ADI, 4/1/2021

2015 ADI The 2015 ADI (v3.0) was constructed using the 2011-2015 5-year estimates from the US Census' American Community Survey. The methods include the suppression and imputation criteria initiated with the 2018 version (see entry dated 11/19/2020) and subsequently processed into the 2015 vintage.

Changes between versions of the ADI, 11/19/2020

2018 ADI The 2018 ADI (v3.0) was constructed using the 2014-2018 5-year estimates from the US Census' American Community Survey. Two methodological changes have been implemented to address missing Census Block Group level data in the underlying ACS data, survey errors and a new geographically-nested imputation method.

(1) Block group suppression: We have applied the same Diez Roux1 suppression criteria used in the earlier 2013 and 2015 builds: any block group with fewer than 100 persons, fewer than 30 housing units, or greater than 33% of the population living in group quarters will not receive an ADI ranking. In addition, we have suppressed of a small number of block groups which include those with survey errors acknowledged by the US Census Bureau.

(2) Imputation of missing ACS items: We have utilized a geographically-nested imputation methodology consistent with those utilized in other area deprivation indices methodologies, including the English Indices of Multiple Deprivation (IMD) and versions of the Scottish Indices of Multiple Deprivation (SIMD).

The 2015 ADI (v3.0) and 2013 (v2.0) were constructed using the 2011-2015 and 2009-2013 5-year estimates from the US Census' American Community Survey. The methods include the suppression and imputation criteria initiated with the 2018 version and subsequently processed into the 2013 and 2015 vintages.

Changes between versions of the ADI, 5/1/2019

2015 and 2013 ADI The 2015 ADI (v2.0) was constructed using the 2011-2015 5-year estimates from the US Census' American Community Survey. The methods are identical to the 2013 ADI construction.

Both the 2013 and 2015 ADI now include suppression criteria based on Diez Roux1 which suppress any block group with fewer than 100 persons, fewer than 30 housing units or greater than 33% of the population living in group quarters.