Table 3. Variance explained (R2) by classes and combinations of classes, per quadrant and dependent. dY is the log of relative change in yield at national level, and dA the log of relative change in cultivated area at national level. N.S. = Not Significant. Sign of relationship refers to whether dA or dY decreases (negative) or increases (positive), upon increasing the quality of governance in the maximal governance class regression equations. Statistical software: R for statistical computing version 2.8.0 (2008).

Growth (Q1), N = 80 Intensifying (Q2), N = 65 All, N = 173
dA dY dA dY dA dY
Control classes
Economic (E) 0.65 0.35 0.39 0.07 0.20 0.25
Demographic (D) 0.56 N.S. 0.20 N.S. 0.34 N.S.
Biophysical (B) 0.33 0.13 N.S. N.S. 0.31 0.04
(E) + (D) + (B) 0.75 0.36 0.56 0.07 0.48 0.27
             
Governance classes
Maximal governance (G) 0.19 0.09 0.08 0.07 0.07 0.09
Marginal governance (E+D+B+G)-(E+D+B) 0.03 0.02 0.00 0.22 0.04 0.02
Sign of relationship - + - + - +