* Data is not centrally collected: Each university's psychology department handles its admissions independently. There's no national organization tracking this specific statistic across all institutions.
* "Direct entry" is variable: Some programs might accept a few highly exceptional undergraduates, while others might never do so. The definition of "direct entry" itself can be loose; some might allow it only with specific undergraduate research experience, others might require a Master's degree first, even if it's a combined program.
* Highly competitive: Direct entry into a PhD program in psychology is extremely rare and competitive. Most students obtain a Master's degree first, often as a stepping stone to strengthen their application for a doctoral program.
In short, while some undergraduates *are* accepted directly into PhD programs in psychology, the number is very small, likely only a handful across the entire country each year. Focusing on obtaining a strong undergraduate record and potentially a Master's degree is a far more realistic path for most aspiring psychology PhD students.