Populations and Controls

Populations and Controls

MATCH_LEVEL Control

MATCH_LEVEL Control

Use the MATCH_LEVEL control to specify the level of matching to perform.
With most standard populations, you can use one of the following predefined match levels:
  • Typical
  • Conservative
  • Loose
The default match level is Typical. You can use the
MATCH_LEVEL
control to adjust the predefined accept or reject score limits that affect the match decisions.
The
MATCH_LEVEL
control uses the following guidelines:
  • If one of the adjusted limits is greater than 100, the limit is set to 100.
  • If one of the adjusted limits is less than 0, the limit is set to 0.
  • If the adjusted accept limit is less than the reject limit, the accept limit is set to the reject limit.
  • If the accept match adjustment is 101, the accept limit is set to 101. As a result, SSA-NAME3 does not accept any record, and SSA-NAME3 either rejects a record or marks it as undecided.
    For example, if
    MATCH_LEVEL=Loose+101-10
    , the accept limit is set to 101.
    If a match call returns a score of 100, SSA-NAME3 marks the record as undecided.
    If a match call returns a score that is less than 100 and less than the reject limit, SSA-NAME3 rejects the record. If the score is less than 100 but greater than or equal to the reject limit, SSA-NAME3 marks the record as undecided.
The
MATCH_LEVEL
control is not applicable to the
Geocode
purpose. If you specify the
MATCH_LEVEL
control with a
Geocode
purpose, SSA-NAME3 ignores the
MATCH_LEVEL
control.
You can use one of the following match level expressions:
matchlevel+/-nn
Adjusts the accept and reject limits by using the same specified number. For example:
MATCH_LEVEL=Typical+20
If the predefined accept limit is 79 and reject limit is 50, the adjusted accept limit is 99 and reject limit is 70.
matchlevel+/-nn+/-nn
Adjusts the accept and reject limits by using the specified numbers. For example:
MATCH_LEVEL=Typical-40+40
If the predefined accept limit is 79 and reject limit is 50, the calculated accept limit is 39, which is less than the reject limit of 90. The adjusted accept limit is set to 90, and the reject limit remains at 90.

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