R : Copyright 2006, The R Foundation for Statistical Computing
Version 2.3.0 (2006-04-24)
ISBN 3-900051-07-0

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> library(drfit)
Loading required package: MASS
Loading required package: RODBC
> data(XY)
> rXY <- drfit(XY)

Control: Fitting data...

Substance X: Fitting data...
Waiting for profiling to be done...

Substance Y: Fitting data...
> rXY
    Substance ndl  n  lld  lhd    mtype  logED50     2.5%    97.5% unit
1     Control   1  6 -Inf -Inf inactive       NA       NA       NA mg/L
2 Substance X   4 12    1    3   probit 2.161905 2.105861 2.214359 mg/L
3 Substance Y   4 12    1    3   active       NA       NA       NA mg/L
       sigma        a         b
1         NA       NA        NA
2 0.04131746 2.161905 0.5061306
3         NA       NA        NA
>