
R version 3.5.0 (2018-04-23) -- "Joy in Playing"
Copyright (C) 2018 The R Foundation for Statistical Computing
Platform: x86_64-apple-darwin15.6.0 (64-bit)

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> library(estimatr)
> lm_robust(extra~group, sleep)
            Estimate Std. Error  t value   Pr(>|t|)   CI Lower CI Upper DF
(Intercept)     0.75  0.5657345 1.325710 0.20151554 -0.4385641 1.938564 18
group2          1.58  0.8490910 1.860813 0.07918671 -0.2038740 3.363874 18
> 
> proc.time()
   user  system elapsed 
  0.782   0.085   0.851 
