FPF

The FPF (false positive filter) comparison function is a filter that assists in determining whether the records being compared represent the same person rather than members belonging to the same family.

The FPF comparison function is used as prerequisite of XNM (Name), DOB (Date) and SEX (Gender) as the comparison speccodes. FPF does not use a comprole. The cmpseqno for FPF should be higher than the setting of XNM, DOB, and SEX.

The rules for FPF are as follows:

  1. If there is a complete mismatch on the name, the FPF is set to true.
  2. If there is a phonetic or partial name match AND either DOB or SEX disagrees, the FPF is set to true. FPF looks at DOB or SEX only if there is a partial match.
  3. If a name suffix disagrees, the FPF is set to true.
  4. ANON values are treated as a 0 in comparisons and are treated neutrally by FPF.

The weight for FPF is looked up in the mpi_wgt1dim table. The entry for index 0 has a value of 0, which implies that FPF is not true. An Index value of 1 implies FPF is set to true and has a weight value (normally around -10.0).