[R] lme convergence

Ravi Varadhan rvaradhan at jhmi.edu
Wed Jun 28 18:52:19 CEST 2006

Use "try" to capture error messages without breaking the loop.

Ravi Varadhan, Ph.D.
Assistant Professor,  The Center on Aging and Health
Division of Geriatric Medicine and Gerontology
Johns Hopkins University
Ph: (410) 502-2619
Fax: (410) 614-9625
Email:  rvaradhan at jhmi.edu
Webpage: http://www.jhsph.edu/agingandhealth/People/Faculty/Varadhan.html 

> -----Original Message-----
> From: r-help-bounces at stat.math.ethz.ch [mailto:r-help-
> bounces at stat.math.ethz.ch] On Behalf Of Pryseley Assam
> Sent: Wednesday, June 28, 2006 12:18 PM
> To: R-Users
> Subject: [R] lme convergence
> Dear R-Users,
>   Is it possible to get the covariance matrix from an lme model that did
> not converge ?
>   I am doing a simulation which entails fitting linear mixed models, using
> a "for loop".
>   Within each loop, i generate a new data set and analyze it using a mixed
> model.  The loop stops When the "lme function" does not converge for a
> simulated dataset. I want to inquire if there is a method to suppress the
> error message from the lme function, or better still, a way of going about
> this issue of the loop ending once the lme function does not converge.
>   Thanks in advance,
>   Pryseley
> ---------------------------------
> 	[[alternative HTML version deleted]]
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