From hdrees@statlab.uni-heidelberg.de  Wed Jul 19 16:47:05 2000
From: hdrees@statlab.uni-heidelberg.de (hdrees@statlab.uni-heidelberg.de)
Date: Wed, 19 Jul 2000 17:47:05 +0200 (MET DST)
Subject: [Rd] bug in loess (PR#611)
Message-ID: <200007191547.RAA09093@pubhealth.ku.dk>

Full_Name: Holger Drees
Version: 1.0.0-1
OS: Windows NT 4.0/Linux Suse 6.3
Submission from: (NULL) (129.206.113.204)


After typing the commands

x <- seq(0,1,by=0.01)
y <- sin(6*x)+rnorm(101)
regtest <- loess(y~x,degree=1,surface="direct",family="symmetric")

regtest$fitted equals NULL. Moreover,

y-regtest$residuals

and 

predict.loess(regtest,x)

give different values, though both are supposed to give the vector of fitted
values.
The latter is the same for both choices of family ("gaussian" and "symmetric").
This holds true for both the WINDOWS and LINUX SUSE 6.3 implementation. (Splus
yields the 
correct results.) This effect occurs only with the option surface="direct".

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[Rd] bug in loess (PR#611)
hdrees@statlab.uni-heidelberg.de