Coefficients of Relations for Probabilistic Reasoning

and we have our "three" as . 003 I . 001. If this ratio is one, we have statistical independence between the events "car brand A" and "car has transaission trouble". The coefficient "three" in the exaaple above is a factor linking two conditional probabilities. Such factors are widely used in current expert systea codes. They are known as "likelihood ratios", "certainty factors", "confidence factors", "evidential factors" (and others), as applied to "weights", "evidence", "beliefs", "rule strengths", "possibilities" (and others), with the purpose of "coabine evidence", "aaintain truth", "update beliefs", "propagate uncertainties" (and others).