Agriculture Reference
In-Depth Information
Table 12.3
Stepwise regression output
Step 1
SUMMARY OUTPUT
Regression Statistics
R
0.92
R Sqr
0.85
Adj R Sqr
0.84
SE
25.86
Obs
37.00
ANOVA
df
SS
MS
F
Significance F
Regression
1
128364.52
128364.52
191.88
0.00
Residual
35
23413.83
668.97
Total
36
151778.35
Coefficients
SE
t Stat
P-value
LB95%
UB 95%
Intercept
100.710
34.690
2.903
0.006
171.134
30.286
X11
57.043
4.118
13.852
0.000
48.683
65.403
Step 2 Include X12
SUMMARY OUTPUT
Regression Statistics
R
0.93
R Sqr
0.86
Adj R Sqr
0.86
SE
24.64
Obs
37.00
ANOVA
df
SS
MS
F
Significance F
Regression
2
131141.57
65570.79
108.03
0.00
Residual
34
20636.78
606.96
Total
36
151778.35
Coefficients
SE
t Stat
P-value
LB95%
UB 95%
Intercept
66.111
36.790
1.797
0.081
140.877
8.655
X12
78.036
36.482
2.139
0.040
152.177
3.895
X11
73.949
8.824
8.381
0.000
56.017
91.881
Step 3: Include X7
SUMMARY OUTPUT
Regression Statistics
R
0.93
R Sqr
0.86
Adj R Sqr
0.85
SE
24.98
Obs
37.00
ANOVA
df
SS
MS
F
Significance F
Regression
3
131186.37
43728.79
70.08
0.00
Residual
33
20591.98
624.00
Total
36
151778.35
