Four RAs at my organization applying for PhD programs this year.
Three males: All very good highly valued RAs, from good undergrad schools, two with co-authorships on impressive working papers. Two took additional grad-level math classes. One with very advanced coding skills. One with a perfect GRE. (I don’t know the others' GREs.)
Results: Schools ranked #15-35
One female: Below average RA (never expressed much interest in research, economists sometimes complained about assigning her tasks), poor coding skills, from an mediocre undergrad, no extra math courses after undergrad, no working paper.
Result: Top 10
A similar pattern happened last year, where the four females all placed in top 10 programs, and the four males placed in rank 10-25. (Though at least last year, the quality of the RAs and their resumes was roughly equal.)