Since all probability suggest that P ( A ∣ B ) {\displaystyle P(A\mid B)} is a value between 0 {\displaystyle 0} and 1 {\displaystyle 1} , the parameter ( c r ) {\displaystyle (cr)} will be a number that is between − 1 {\displaystyle -1} and 1 {\displaystyle 1}