Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality (AHRQ).Access to the NRD is restricted; the data may be purchased through the HCUP Central Distributor, subject to data use agreement and associated costs.Researchers may request access via HCUP.The authors do not have the authority to share the NRD dataset directly.For more information on obtaining the NRD, visit: HCUP NRD (2018) documentation.
Jouppi et al. (Fri,) studied this question.