summary（）函数
在线性模型中可以计算出结果：
Residual standard error: 23.21 on 260 degrees of freedom
Multiple R-squared: 0.9144, Adjusted R-squared: 0.9114
F-statistic: 308.6 on 9 and 260 DF, p-value: < 2.2e-16
但是在非线性模型中只有结果

Residual standard error: 23.21 on 260 degrees of freedom
Number of iterations to convergence: 11

Achieved convergence tolerance: 6.261e-06

请问如何在非线性模型中求出Multiple R-squared: 0.9144, Adjusted R-squared: 0.9114
F-statistic: 308.6 on 9 and 260 DF, p-value: < 2.2e-16

不胜感激