110 Discrete Event Simulation for Health Technology Assessment
that weighting will be based on and then creating an additional eld in the
source records to tag them according to the prole they represent. Various
methods for weighted sampling can then be applied. If the weights will not
change (i.e., there is a xed target population), then this can be simplied by
copying records with the desired proles until the enlarged source popula-
tion reects the desired mix.
Often, even when there are individual records available to use in assigning
attribute values, some necessary characteristics may be missing. Rather than
abandon the use of individual data, a hybrid approach can be used by apply-
ing the kind of technique that is used by statist ...