Hello everyone,
I want to study the efficiency of banks using Data Envelopment Analysis (DEA). When I run output-oriented DEA based on the variable return to scale I get CRS, VRS, NIRS and SCALE efficiency with their RTS. As I know if the value of the NIRS efficiency score is equal to the VRS efficiency score then decreasing return to scale exits. Otherwise increasing return to scale exits. Can anyone tell me how Stata calculates those RTS?

Thank you.