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startd
2011 Dec 11
1
nls start values
I'm using nls to fit periodic gene-expression data to sine waves. I need
to set the upper and lower boundaries, because I do not want any
negative phase and amplitude solutions. This means that I have to use
the "port" algorithm. The problem is, that depending on what start value
I choose for phase, the fit works for some cases, but not for others.
In the example below, the fit works