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