Displaying 2 results from an estimated 2 matches for "yresp".
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2003 Nov 25
1
problem plotting curve through data
I'm having trouble plotting a curve (basically a dose-response
function) through a set of data.
I have created a dataframe (df) of Stimulus Intensities (xstim) and
Normalized Responses (yresp), and I've used nls() to calculate a nonlinear
regression, like so:
--------------------
> f <- yresp ~ xstim^n / (xstim^n + B^n)
> starts <- list(n=.6, B=11)
> myfit <- nls(formula=f, data=df, start = starts)
>myfit
Nonlinear regression model
model: yresp ~ xstim^n/...
2006 Mar 22
1
An lme model that works in old R.2.1.1 but not always in R.2.2.0 - why?
Following lme model runs fine in general under R.2.1.1 but only for 9 out
of my 11 response variables under R.2.2.0.
model for one of my response variables:
lme(Yresp~F1fix,random=list(const=pdBlocked(list(~F2mix-1,~Ass:F1fix-1,~F3mix-1,~F1fix:F3mix-1,~F2mix:F3mix-1),pdClass="pdIdent")))
Yresp is my response variable, F1fix is a fixed effect factor whereas
F2mix and F3mix are random effect factors.
const is set to rep(1,dim(Ycont)[1]).
The strange th...