Fig. 6
From: Identifying couples in administrative dataIdentifizierung von Ehepaaren in Administrativen Daten
Frequency of Surnames in Population and Among Matched Couples. (Note: Each dot in the figure represents one unique last name in our data (such as Meier or Mueller). The figure shows the frequency of each last name in the overall population (x-axis) and among the sample of matched couples (y-axis). The black line represents the 45 degree line, suggesting that most names are equally common in the overall population and among matched couples)