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...nls( + conc~ K-(K*exp(-(vel/alpha)^beta)), df, start= 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...

...e 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 [[alternative HTML version deleted]]

...tion. I am implementing countries and its corresponding states dropdown through Ajax and I have used collection_select method to select countries. Now for editing point of view I want the country which is selected earlier should come. Please let me know if someone has any idea about this. Thanks Ruchita Sharma. -- Posted via http://www.ruby-forum.com/. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@pub...

...d return to the login page with username and password fields to be filled into the text boxes and the checkbox button checked, so that there is no need to fill all the fields. I am not able to fill the text boxes with user name and password fields. Any help would be greatly appreciated. Thanks, Ruchita. -- Posted via http://www.ruby-forum.com/. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gma...