AttractionLink

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In PLN [Not implemented]

AttractionLink <TV>
  X
  Y

the TV on the AttractionLink represents the difference between P(Y|X) and P(Y|Not X). For instance if X and Y are concepts, the strength of TV (letting aside the influence of confidence for now) will be

TV.s = max(0, TV1.s - TV2.s)

where TV1.s and TV2.s are defined with

InheritanceLink <TV1>
  X
  Y
InheritanceLink <TV2>
  Not X
  Y

It is therefore not a probability (or at least not obviously so).