Table 5. Stepwise regression with the dominant factors against alfalfa productivity based on field trial data collected from 1983 to 2008
Parameter
Standardized coefficient
p
-value
VIF
R
^{2}
change
R
^{2}
Factor 1
0.633
0.000
1.002
0.379
0.602
Factor 2
0.485
0.000
1.001
0.210
Factor 3
0.115
0.012
1.001
0.013
VIF, variance inflation factors.