Calculates probability and conditional probability of events.
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a probability space or a subset of one.
logical expression indicating elements or rows of
either a subset of a probability space or a logical expression indicating elements or rows of
further arguments to be passed to or from other methods.
This function calculates the probability of events or subsets of a given sample space.
Conditional probability is also implemented. In essence, the
Prob() function operates by summing the
probs column of its argument. It will find subsets on the fly if desired.
event argument is used to define a subset of
x, that is, the only outcomes used in the probability calculation will be those that are elements of
x and satisfy
event simultaneously. In other words,
Prob(intersect(x, subset(x, event))). Consequently,
x should be the entire probability space in the case that
event is non-null.
There is some flexibility in the
given argument in that it can be either a data frame or it can be a logical expression that defines the subset. However, that flexibility is limited. In particular, if
given is a logical expression, then
event must also be specified (also a logical expression). And in this case, the argument
x should be the entire sample space, not a subset thereof.
A number in the interval
G. Jay Kerns [email protected].
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