ALR: Memory and time issues

Cande V Ananth (ananthcv@EPI.UMDNJ.EDU)
Thu, 15 Jan 1998 09:04:11 -0500

Fellow SPlus'ers:

I'm attempting to fit a (bivariate) logistic regression model on
a data set containing 10,500 obs, using the ALR routine. The
marginal model contains 4 covariates (plus an intercept) and the
pairwise association model contains 4 binary and 1 continuous

The trouble that I'm encountering is that even after 12 hours, I
don't have the results -- the algorithm seems to be crunching away
to glory ! This is only one of my preliminary model, and I'll need
to fit several such models before I come up with a best fitting

I have provided reasonably good starting values for the log OR model
(based on crude associations), and the ALR routine fits a GLM to
obtain the starting values for the marginal model parameters. I am
using a SUN Sparc workstation and Splus (version 3.4) operating on
SunOS 5.3

I will greatly appreciate comments on how to get the results quickly
(if at all possible !). Thanks in advance. If additional information
is required, I'll be glad to provide them.


Cande V. Ananth, PhD, MPH ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ The Center for Perinatal Health Initiatives Dept of OB/GYN and Reproductive Sciences Tel: (732) 235-7940 Univ of Medicine and Dentistry of New Jersey Fax: (732) 235-6627 Robert Wood Johnson Medical School ananthcv@EPI.UMDNJ.EDU 125 Paterson St, New Brunswick NJ 08901-1977 ,,, (o-o) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ooO-(_)-Ooo