The National Deliverability Index System (NDI) measures and improves address quality through seven quality indicators. The NDI Report shows how many records fulfill each criteria required for each quality indicator. The categories are represented by the number of addresses:
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Matched and standardized against the ZIP + 4 file
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Containing apartment numbers
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Containing rural route and box number information
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Containing correct 5-digit ZIP Codes
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Containing carrier route codes