This paper extends the multistage procedure set out by Fried, Schmidt, and Yaisawarng (1999) to examine the importance of environmental factors when assessing the technical efficiency of water agencies. However, following Simar and Wilson’s (2007) critique of multistage efficiency analyses,...

This paper extends the multistage procedure set out in Fried et al (1999) to examine the importance of environmental factors when assessing the technical efficiency of water agencies. However, following Simar and Wilson’s (2007) critique of multistage efficiency analyses, the paper uses a...