Corroborative Index

Address Recognition CI

What is the Corroborative Index (CI)?

The Corroborative Index (CI) is a value between 0 and 1 assigned to each recognized address in DMTI’s database that represents a measure of likelihood that it exists. The CI is calculated based on both the quantity and the quality of source data that reference a specific address. Source data, which comes to DMTI from more than 7,300 federal, municipal and private partners, is weighted based on a number of factors including year of acquisition, extent of coverage, original purpose of source and method of collection. Together, these characteristics tie into a formula which helps users validate which of their addresses are real and which might not be.

What do the CI ranges represent?

Using our CI formula, we have definitions for CI values which can be used to help instruct your business processes.

CI Value	Significance
0	There is no evidence in support of the existence of the address.
0 < x <= 0.3	There is evidence that the address exists in a street segment range
0.3 < x <= 0.5	The address is likely to exist, more evidence will be collected when possible but this value is sufficient to believe the object is present.
0.5 < x <= 0.95	The address is very likely present
x > 0.95	The address is almost certain to be present based on one or more physical visits by a trusted and verified source