[R] parameter asterisks

Hello, Is there a clearcut answer as to why R prints 'NA' sometimes instead of standard errors? mle2(minuslogl = nlikfun4, start = list(a = 1, c = 1, d = 0.2, b = 0.1, b1 = 0.1), method = Nelder-Mead) Coefficients: Estimate Std. Error z value Pr(z) a 3.83845751 0.47320236 8.1117 4.993e-16

Re: [R] parameter asterisks

alexander russell-2 wrote: Hello, Is there a clearcut answer as to why R prints 'NA' sometimes instead of standard errors? mle2(minuslogl = nlikfun4, start = list(a = 1, c = 1, d = 0.2, b = 0.1, b1 = 0.1), method = Nelder-Mead) Coefficients: Estimate Std. Error z value Pr(z)