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2005 Dec 06
3
strange behavior of loess() & predict()
Dear altogether,
I tried local regression with the following data. These data are a part
of a bigger dataset for which loess is no problem.
However, the plot shows extreme values and by looking into the fits, it
reveals very extreme values (up to 20000 !) although the original data are
> summary(cbind(x,y))
x y
Min. :1.800 Min. :2.000
1st Qu.:2.550
2009 Dec 01
2
Starting estimates for nls Exponential Fit
Hello everyone,
I have come across a bit of an odd problem: I am currently analysing data
PCR reaction data of which part is behaving exponential. I would like to fit
the exponential part to the following:
y0 + alpha * E^t
In which Y0 is the groundphase, alpha a fluorescence factor, E the
efficiency of the reaction & t is time (in cycles)
I can get this to work for most of my reactions,