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Table 3 Summary of efficiency scores and percentage forms of returns to scale

From: Changes in the technical and scale efficiency of rice production activities in the Mekong delta, Vietnam

Mean scores 1998 2002 2004 2006 2008 2010
Original technical efficiency (VRS) 0.534 0.547 0.631 0.699 0.677 0.650
Corrected technical efficiency (VRS) 0.484 0.497 0.593 0.667 0.645 0.606
Scale efficiency 0.925 0.895 0.927 0.935 0.942 0.902
Percentage Constant returns to scale 1.2 1.2 1.3 1.1 2.7 0.9
Increasing returns to scale 52.7 73.9 69.6 32.6 75.4 69.3
Decreasing returns to scale 46.1 24.9 29.1 66.3 21.9 29.8
  1. Source: Own calculations based on (GSO, General Statistics Office of Vietnam 1998, GSO, General Statistics Office of Vietnam 2002, GSO, General Statistics Office of Vietnam 2004, GSO, General Statistics Office of Vietnam 2006b, GSO, General Statistics Office of Vietnam 2008, GSO, General Statistics Office of Vietnam 2010).