search for: optre

Displaying 2 results from an estimated 2 matches for "optre".

Did you mean: optra
2010 Nov 03
3
optim works on command-line but not inside a function
Dear all, I am trying to optimize a logistic function using optim, inside the following functions: #Estimating a and b from thetas and outcomes by ML IRT.estimate.abFromThetaX <- function(t, X, inits, lw=c(-Inf,-Inf), up=rep(Inf,2)){ optRes <- optim(inits, method="L-BFGS-B", fn=IRT.llZetaLambdaCorrNan, gr=IRT.gradZL, lower=lw, upper=up, t=t, X=X) c(optRes$par[2], -(optRes$par[1]/optRes$par[2]) ) } #Estimating a and b from thetas and outcomes by ML, avoiding 0*log(0) IRT.estimate.abFromThetaX2 <- f...
2006 Jul 23
1
How to pass eval.max from lme() to nlminb?
Dear R community, I'm fitting a complex mixed-effects model that requires numerous iterations and function evaluations. I note that nlminb accepts a list of control parameters, including eval.max. Is there a way to change the default eval.max value for nlminb when it is being called from lme? Thanks for any thoughts, Andrew -- Andrew Robinson Department of Mathematics and Statistics