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adoption
2011 Jun 15
4
Problems with nls
I'm trying to fit the Bass Diffusion Model using the nls function in R but
I'm running into a strange problem. The model has either two or three
parameters, depending on how it's parameterized, p (coefficient of
innovation), q (coefficient of immitation), and sometimes m (maximum market
share). Regardless of how I parameterize the model I get an error saying
that the step factor has