Displaying 2 results from an estimated 2 matches for "ruchitarg123".
2009 Dec 18
2
NLS-Weibull-ERROR
...para0.st,trace=T)
Error in nlsModel(formula, mf, start, wts) :
singular gradient matrix at initial parameter estimates
I will be highly thankful if some one can please let me know where is the
mistake as i m unable to trace it.
Thanks
Ruchita
On Wed, Dec 16, 2009 at 3:18 PM, ruchita gupta <ruchitarg123@gmail.com>wrote:
> Hello
>
> After performing NLS estimates for some sigmoid model(like logistic growth
> model and Gompertz growth models), how can we get the RMSE(root mean square
> error) and MAPE(mean absolute percentage error) in R statistical tool for
> comparison betw...
2009 Dec 14
2
R square in NLS-urgent help
Hello
I need one urgent help
I am trying to fit the Sigmod curve of logistic growth model using NLS
estimation.
But i do not get the R square value in that even after getting the "Summary"
In that case how to compare the fit for 3 models and find which one is
better fit??
How to get this R Square value when using NLS estimation?
Thanks
Ruchita
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