Final answer:
The research described is an example of archival research, which involves using existing records or data sets to answer research questions.
Step-by-step explanation:
The research described in the question is an example of archival research. Archival research involves using existing records or data sets to answer research questions. In this case, Dr. Yee collected the medical records of thirty women who display symptoms of a chronic illness and identified factors in their records that contributed to the development of their current illness.