Sigmoid curve that converts the sum of positive and negative points that increase or decrease (respectively) into a confidence value.  0.5 indicates neutral confidence whereas 0.99 indicates high confidence. 

 
  Part of: Patterson D, Mozzherin D, Shorthouse D, Thessen A (2016) Challenges with using names to link digital biodiversity information. Biodiversity Data Journal 4: e8080. https://doi.org/10.3897/BDJ.4.e8080