How accurate are İEA's polls?

ELECTIONİEA POLLACTUAL RESULT
2023-05-28 Cumhurbaşkanlığı 2. Tur
Erdoğan: 51.9%
Kılıçdaroğlu: 48.1%
Erdoğan: 52.18%
Kılıçdaroğlu: 47.82%
2023-05-14 Cumhurbaşkanlığı 1. Tur
Erdoğan: 45.6%
Kılıçdaroğlu: 50.5%
Oğan: 3.9%
Erdoğan: 49.52%
Kılıçdaroğlu: 44.88%
Oğan: 5.17%
2023-05-14 Genel Seçim
Cumhur: 44.9%
Millet: 40.7%
Emek: 10.5%
Cumhur: 49.49%
Millet: 35.04%
Emek: 10.55%
2019-06-23 İstanbul Belediye (tekrar)
Yıldırım: 46.99%
İmamoğlu: 52.11%
Yıldırım: 45%
İmamoğlu: 54.22%
2018-06-24 Genel Seçim
Cumhur: 44.5%
Millet: 40.5%
HDP: 13.5%
Cumhur: 53.7%
Millet: 33.9%
HDP: 11.7%