Before revision:  We also generalize the notion of comparison data to allow for treatment of very common first names that spuriously produce exact matches in record pairs and show how to estimate true positive rate and positive predictive value when ground truth is unavailable.
After revision:  We also generalize the notion of comparison data to allow for treatment of very common first names that spuriously produce exact matches in record pairs and show how to estimate true positive rate and positive predictive value when true match status is unavailable.