Thanks very much for your kindness help. I run your script then came out lots of outputs and I also studied the solution you posted. Forgive my ignorance, I still can't find the suitable starting values. Did I misunderstand something?
Best, Pinglei Gao -----邮件原件----- 发件人: ProfJCNash [mailto:profjcn...@gmail.com] 发送时间: 2016年10月10日 10:41 收件人: Gabor Grothendieck; Pinglei Gao 主题: Re: [R] Finding starting values for the parameters using nls() or nls2() I forgot to post the "solution" found by nlmrt: nlmrt class object: x residual sumsquares = 1086.8 on 15 observations after 5001 Jacobian and 6991 function evaluations name coeff SE tstat pval gradient JSingval b0 5.3274e-14 NA NA NA -6.614e+13 1.735e+16 b1 33.5574 NA NA NA -3.466 11518 th -0.00721203 NA NA NA -740.8 0.004635 Note the singular values -- this is the worst SV(max)/SV(min) ratio I've observed! JN ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
