For those of you who use Marketscape Strategy extensively, you are familiar with the vast number of metrics that are available for you to add to your table on the Explore page. One set of metrics that you might run into will include (HRR) or HRR Benchmark in the metric name: (See examples)
Hospital referral regions (HRRs) represent regional health care markets for tertiary medical care. Each HRR contains at least one hospital that performs major cardiovascular procedures and neurosurgery. HRRs were defined by assigning HSAs to the region where the greatest proportion of major cardiovascular procedures were performed, with minor modifications to achieve geographic contiguity, a minimum population size of 120,000, and a high localization index. The process resulted in 306 hospital referral regions. More information on how HSAs and HRRs were defined is available in the following article from Dartmouth Appendix on the Geography of Health Care in the United States.
Trella Health uses Dartmouth's methodology.
Any metric in Marketscape Strategy that includes HRR in the name is calculated based on data restricted by the relevant HRR. For example, if the metric is a patient count or costs related to patients, the data used for the metric calculation would be based on patients who resided in the HRR Region.
Since metrics based on HRR are calculated on a limited patient population, you could make a comparison to the parallel metric for all patients not limited to the HRR.