R version 3.1.1 (2014-07-10) -- "Sock it to Me"
Copyright (C) 2014 The R Foundation for Statistical Computing
Platform: x86_64-pc-linux-gnu (64-bit)

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> library(drfit)
> data(antifoul)
> rantifoul <- drfit(antifoul)

TBT: Fitting data...

Waiting for profiling to be done...

Zn Pyrithion: Fitting data...

Waiting for profiling to be done...
> print(rantifoul,digits=5)
     Substance ndl   n     lld    lhd  mtype  logED50     2.5%     97.5%   unit
1          TBT  38 135 -2.7093 2.3979 probit -0.16436 -0.26504 -0.056498 microM
2 Zn Pyrithion  27  81 -2.1072 2.0000 probit -0.39792 -0.50783 -0.291563 microM
    sigma        a       b
1 0.19286 -0.16436 0.67637
2 0.22866 -0.39792 0.41696
> 
> proc.time()
   user  system elapsed 
  0.743   0.555   0.612