For each exposure X in E, we calculated
the share of the combined effect of
eliminating all exposures in E that can
be attributed to X. There are several
concepts for partitioning the joint AR
of a set of exposures.17,18 An important
common property is the additivity; the
sum of all shares equals the joint AR of
the entire set E.
We concentrated on partial AR (PAR),
which can bedetermined by the Shapley
formula14: