Displaying 2 results from an estimated 2 matches for "ryegrass".
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rgrass
2010 Nov 28
1
predict.drm not generating confidence intervals
...,
I recently submitted a help request for the predict.drm function found in the drc package. I am still having issues with the function and I am submitting reproducible code hoping that somebody can help me figure out what is going on.
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library(drc)
# Fit a 4 parameter logistic model to ryegrass dataset
fit <- drm(rootl ~ conc, data = ryegrass, fct = LL.4())
summary(fit)
# Generate a fake dataset for prediction
newdt <- data.frame( matrix(c(seq(0.2, 9, 0.01), rep(NA,881)), ncol=2))
colnames(newdt) <- c('rootl', 'conc')
# Generate prediction intervals and confide...
2007 Apr 17
2
how to estimate dose from respond given drc package result
Dear all,
I can use the very nice drc package (multdrc()) to model and plot a
dataframe containing dose and response values. I can also use
predict.drc() to yield response values given a dose. I need to do the
opposite, estimate a dose given the response. The general predict
documentation seems to say that this is possible, but it does not
appear that predict.drc has that capability.