This technique is so cool!
To find out for instance that 25% young men voted AfD (🥲) compared to 15% young women, they don't need to rely on exit polls or ecological inference. They have the actual ballots.
Reposted from Ansgar Wolsing
It's called representative electoral statistics ("Repräsentative Wahlstatistik"). Ballot papers in randomly selected voting places get marked with sociodemographic information: about gender and the age group (10 age groups in total). In 2021, 1.9 million eligible voters were included.

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