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2009 May 20
2
drc results differ for different versions
Hello,
We use drc to fit dose-response curves, recently we discovered that
there are quite different standard error values returned for the same
dataset depending on the drc-version / R-version that was used (not
clear which factor is important)
On R 2.9.0 using drc_1.6-3 we get an IC50 of 1.27447 and a standard
error on the IC50 of 0.43540
Whereas on R 2.7.0 using drc_1.4-2 the IC50 is