The Digital Divide Index or DDI ranges in value from 0 to 100, where 100 indicates the highest digital divide. It is composed of two scores, also ranging from 0 to 100: the infrastructure/adoption (INFA) score and the socioeconomic (SE) score.
The INFA score groups four variables related to broadband infrastructure and adoption: (1) percentage of total 2010 population without access to fixed broadband of at least 25 Mbps download and 3 Mbps upload; (2) number of residential broadband connections with at least 10 Mbps download and 1 Mbps upload; (3) average maximum advertised download speeds; and (4) average maximum advertised upload speeds.
The SE score groups four variables known to impact technology adoption: (1) percent population ages 65 and over; (2) percent population 25 and over with less than high school; (3) individual poverty rate; and (4) percent of noninstitutionalized civilian population with a disability. In other words, these variable indirectly measure adoption since they are potential predictors of lagging technology adoption.
These two scores are combined to calculate the overall DDI score. If a particular county or census tract has a higher INFA score versus a SE score, efforts should be made to improve broadband infrastructure. If on the other hand, a particular geography has a higher SE score versus an INFA score, efforts should be made to increase digital literacy and exposure to the technology’s benefits.
The DDI measures primarily physical access/adoption and socioeconomic characteristics that may limit motivation, skills, and usage. Due to data limitations it was designed as a descriptive and pragmatic tool and is not intended to be comprehensive. Rather, it should help initiate important discussions among community leaders and residents.
Download & Upload Speeds
|Average Download Speeds||28.8 Mbps||Mbps|
|Maximum Download Speeds||50.9 Mbps||Mbps|
|Minimum Download Speeds||18.7 Mbps||Mbps|
|Average Upload Speeds||5.1 Mbps||Mbps|
|Maximum Upload Speeds||7.2 Mbps||Mbps|
|Minimum Upload Speeds||3.7 Mbps||Mbps|
Access & Adoption
|Population with no access to broadband 25/3|
|Average population with no access||12.3%|
|Maximum population with no access||99.7%|
|Minimum population with no access||0.0%|
|Households with broadband connection 10/1|
|Average households with broadband connection||20.0 - 39.9%|
|Maximum households with broadband connection||60.0 - 79.9%|
|Minimum households with broadband connection||0.1 - 19.9%|
|Digital Divide Scores|
|Average Digital Divide Score||45.0|
|Maximum Digital Divide Score||63.9|
|Minimum Digital Divide Score||24.4|
|Average Socioeconomic Score||36.0|
|Maximum Socioeconomic Score||40.5|
|Minimum Socioeconomic Score||27.6|
|Average Infrastructure Score||53.8|
|Maximum Infrastructure Score||93.9|
|Minimum Infrastructure Score||27.7|