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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bug in loess (PR#611)
2 messages · hdrees@statlab.uni-heidelberg.de, Brian Ripley
On Wed, 19 Jul 2000 hdrees@statlab.uni-heidelberg.de wrote:
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".
Since you have clearly looked into this, could you please provide a patch which gives the correct answers.
Brian D. Ripley, ripley@stats.ox.ac.uk Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272860 (secr) Oxford OX1 3TG, UK Fax: +44 1865 272595 -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-devel mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-devel-request@stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._