  The utility of capture-recapture methods is offset by strong underlying
assumptions. In this paper we discuss a failure in the perfect linkage
assumption in a special case of capture-recapture known as the dual system
estimation. We propose a naive linkage error corrected dual system estimator.
The advantage of the proposed approach compared with the existing linkage error
corrected methods is that it permits an easy way to obtain the corresponding
variance estimator.
