If you only want a simple linear regression, you might also want to try
xyplot(t~s|factor(lonLabels[whichLon100])*factor(latLabels[whichLat100]),
+ � data=P100,pch=".", type =c("p","r")- type "r" will automatically fit and plot the regression line for you. Hadley ______________________________________________ [EMAIL PROTECTED] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
