版本：R x64 3.4.1
输入：> lm(mpg~wt,data=mtcars)
Call:
lm(formula = mpg ~ wt, data = mtcars)
Coefficients:
(Intercept)           wt  
     37.285       -5.344  
> lmfit<-lm(mpg~wt,data=mtcars)
> summary(lmfit)
Call:
lm(formula = mpg ~ wt, data = mtcars)
Residuals:
    Min      1Q  Median      3Q     Max
-4.5432 -2.3647 -0.1252  1.4096  6.8727
Coefficients:
            Estimate Std. Error t value Pr(>|t|)   
(Intercept)  37.2851     1.8776  19.858  < 2e-16 ***
wt           -5.3445     0.5591  -9.559 1.29e-10 ***
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1
Residual standard error: 3.046 on 30 degrees of freedom
Multiple R-squared:  0.7528,    Adjusted R-squared:  0.7446
F-statistic: 91.38 on 1 and 30 DF,  p-value: 1.294e-10
> plot(lmfit)
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> cook<-cooks.distance(lmfit)
> plot(cook)
> with(mtcars,{summary(mpg,disp,wt)plot(mpg,disp)plot(mpg,wt)})
错误: unexpected symbol in "with(mtcars,{summary(mpg,disp,wt)plot"
> with(mtcars,summary(mpg))
   Min. 1st Qu.  Median    Mean 3rd Qu.    Max.
  10.40   15.43   19.20   20.09   22.80   33.90
> with(mtcars,{nokeepststs<-summary(mpg)keepstats<<-summary(mpg)})
错误: unexpected symbol in "with(mtcars,{nokeepststs<-summary(mpg)keepstats"
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