Posttest probability = Posttest odds / (Posttest odds 1) Fagan nomogram The relation can also be estimated by a socalled Fagan nomogram (shown at right) by making a straight line from the point of the given pretest probability to the given likelihood ratio in their scales, which, in turn, estimates the posttest probability at the point where that straight line crosses its scale The What is the difference between odds and probability The Ask Dr Math forum has several entries on odds versus probability Summarizing, one way to conceptualize (nontechnically) the probability of an event is the number of ways that an event can occur divided by the total number of possible outcomes The probability of heads in a fair coin flip is 1/2 (50The general rule for the conversion of (any type of) odds into an implied probability can be expressed as a formula Rule Plug the numbers into the formula, which is a simple matter of
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