[R] nlmrt problems - No confInt, NA StdErr, t-, or p-values

DANIEL PRECIADO danprec at hotmail.com
Tue Mar 21 11:57:17 CET 2017

Dear list,

I want to use nlxb (package nlmrt) to fit different datasets to a gaussian, obtain parameters (including standard error, t-and p-value) and confidence intervals.

nlxb generates the parameters, but very often results in NA standard error,t-and p-values. Furthermore, using confint() to obtain the confidence intervals generates a : Error in vcov.default(object) :   object does not have variance-covariance matrix" erro.

Can someone indicate why is nlxb generating NAs (when nls has no problem with them) and how to obtain confidence intervals from an nlmrt object?


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