R Under development (unstable) (2025-08-17 r88631 ucrt) -- "Unsuffered Consequences"
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> # efficiency.R --- Test function efficiency
> 
> library(usl)
> 
> data(specsdm91)
> 
> options(digits=3)
> 
> u <- usl(throughput ~ load, specsdm91)
> 
> efficiency(u)
     1     18     36     72    108    144    216 
0.7211 0.6148 0.5100 0.2860 0.1882 0.1370 0.0876 
> 
> proc.time()
   user  system elapsed 
   0.18    0.04    0.23