P: Probability function
In pimdevel: Probabilistic Index Models

Description Usage Arguments Details Value Examples

This functions transform a comparison or otherwise logical value to a numeric value for use in a pim.

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P(x)

PO(x, y = NULL)

`x`	for `P`, a logical value. For `PO` a numeric value.
`y`	a numeric value or `NULL`. If `NULL`, the function will try to calculate `PO(L(x),R(x))`, provided the functions `L` and `R` are defined correctly. This is the case when `PO` is used in the context of a probabilistic index model fitted with `pim`.

These functions are constructed purely for notation. P is completely equivalent to as.numeric, apart from an extra control to check whether it actually makes sense to do so. The function PO is just short for P(x < y) + 0.5*P(x == y)

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