Seoul mayoral race remains too close to call - The Korea Times

Polling firms show discrepancies ahead of local elections in Korea despite shared survey methods

Korean polling firms reported divergent Seoul mayoral results (Chong: 39% vs 49.6%) despite using identical telephone interview methods, revealing significant 'house effect' driven by question wording and interviewer techniques. The systematic measurement variance illustrates how design choices—questionnaire wording, survey methodology—shape outcomes, underscoring data quality risks relevant to tech leaders managing AI training sets and feedback mechanisms.