Completeness of population-based registration systems is recognized to be an important
aspect of the quality of information in registries which has to be examined. In this
paper a model is presented which was used to estimate completeness of reporting of
Down syndrome data notified to the Styrian Malformation registry between 1985-92.
The model introduced is based on the two-source capture-recapture method allowing
for time-varying parameters. For estimation of the parameters a discrete-time filtering
algorithm was developed. For the used data set, an estimate of completeness derived
from this model was in good agreement with an independent estimator based on demographic
data and maternal age-specific Down syndrome risks whereas the usual two-source capture-recapture
method gave a higher estimate.
Keywords
Capture-Recapture Methods - Dynamic Model - Registration - Down Syndrome