$\widehat{\gamma }$

Estimate

Std. Error

t value

Pr(>|t|)

${\widehat{\gamma }}_{面积}$

0.27834

0.02800

9.939

9.67e−14***

${\widehat{\gamma }}_{动力}$

0.08564

0.04822

1.776

0.08146 .

${\widehat{\gamma }}_{化肥}$

2.68839

0.81361

3.304

0.00171**