Message-ID: <3F27E010.4050802@uv.es>
Date: 2003-07-30T15:11:12Z
From: Joerg Schaber
Subject: robust regression
Hi,
trying to do a robudt regression of a two-way linear model, I keep
getting the following error:
> lqs(obs ~ y + s -1,method="lms", contrasts=list(s=("contr.sum")))
Error: lqs failed: all the samples were singular
Robust regression with M-estimators works (also regular least square
fits, of course):
rlm.formula(formula = obs ~ y + s - 1, method = "M", contrasts = list(s
= ("contr.sum")))
I tried an exact sampling (psamp="exact"), but I keep getting syntax
errors. Any idea how I can make the first one work?
Thanks,
joerg
--
----------------------------------------------------------
J?rg Schaber
Instituto Cavanilles de Biodiversidad y Biologia Evolutiva
Universidad de Valencia Tel.: ++34 96 354 3666
A.C. 22085 Fax.: ++34 96 354 3670
46071 Valencia, Espa?a email : jos at uv.es