Displaying 4 results from an estimated 4 matches similar to: "Curva dosis-respuesta"
2008 Feb 26
1
multdrc error---Error in mdrcOpt(opfct, startVec, optMethod, derFlag, constrained, warnVal
Hi,
I am newbie of R. I a currently using multdrc object to generate fitting
curve and IC50. My 384 well format raw data contains multi dose response
curves. My script goes through set of data then produce curve and ic50.
Here is my sudo code:
For (plateid in platelist)
{
Input data (plateid) as matrix
Curve fitting
model4logistic <- multdrc(rdata ~ ld, logDose=10)
}
2011 Feb 23
0
Don't know which model in"drc" package is to be used to find EC values.
Hi every one,
I am using the package 'drc' to model root elongation using dose
response data. I don't know which model I should use. Though I don't
know which model I should use, I tried the following codes given
below. But it produced the error messages.Can any one tell me the code
in 'drc' package to find out the EC (Effective Concentration) values
and Confidence
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
2010 May 21
0
weighted regression using drm() in drc package
Hi, I am currently trying to do dose-response curves
using weighted 4-parameter model (4PL). The weighting was based on
1/(expected variance) derived from historical data. I tried both drm() from drc package, and nls(), found very different
results derived from drm() vs. nls() using "weights=" argument.
d1<-read.table("d1.txt",sep='\t',header=T,row.names=1)