36843 Total applicants
6016 EA applicants
~3369 (56% of EA) Deferred from early to RD
34196 Total applicants considered in RD round
2178 Total Admits
55 Questbridge Admits
794 EA Admits
1329 RD Admits
1329/34196 = 3.89% RD acceptance rate
sources
EA and Questbridge https://news.yale.edu/2018/12/14/794-early-action-applicants-admitted-class-2023
Overall and RD https://yaledailynews.com/blog/2019/03/28/yale-admits-5-91-percent-of-applicants/