search for: jcjorgensen

...be in the proper directories.] I've done everything except modify the rprofile or the options(). Is that necessary, and if so how exactly do I do that? And, if I do modify them how do I restore them back to their default settings? Any help would be much appreciated. Thanks, Jeff Jorgensen jcjorgensen at wisc.edu

Hello, I have set up a data.frame and one of the columns contains a date of the form (with slashes as separators): mm/dd/yyyy I would like to use formulas on other columns in the data.frame organized by date, for example: tapply(var1, sort(date), mean) However, when I try sort(date) it sorts based on the first two entries in the date field: 9/1/2001 9/1/2002 9/1/2003 9/2/2001 ... 5.6 7.5

...ol) (BTW, does col=color?) so that I can readjust the label locations (at=...), or have I completely missed something obvious that would quickly fix this up? Cheers, Jeff Jorgensen ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Jeff Jorgensen Center for Limnology jcjorgensen at wisc.edu University of Wisconsin Madison ph (608) 263-2304 680 North Park Street fx (608) 265-2340 Madison, Wisconsin 53706 http://limnology.wisc.edu ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

...or the lattice package that explain how to add lines, such as with lines() or ?, to a levelplot. I'd be grateful if someone could point me in the proper direction. Cheers, Jeff ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Jeff Jorgensen Center for Limnology jcjorgensen at wisc.edu University of Wisconsin Madison ph (608) 263-2304 680 North Park Street fx (608) 265-2340 Madison, Wisconsin 53706 http://limnology.wisc.edu ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Hi R-sters, Just wondering what I might be doing wrong. I'm trying to fit a multiple linear regression model, and being ever mindful about the possibilities of autocorrelation in the errors (it's a time series), the errors appear to follow an AR1 process (ar(ts(glsfit$residuals)) selected order 1). So, when I go back and try to do the simultaneous regression and error fit with gls,

R-sters: I'm interested in keeping data plotted in persp to preserve the wireframe look, I'd just like to change one of the lines drawn (in either the x or y direction) into a different color so that it stands out. Or is there some way to add a line (say, via lines(), or abline()) to a persp() plot at the designated x or y that would follow the z surface contour? I could add a line

Dear R-sters, I was wondering if anyone has encountered the following issues. I've figured out how to get multiple levelplots [library(lattice)] on a single plot. However, when I add text (adding axis labels for the entire four panel plot) the text is missing when I insert the *.eps file I've created into my LaTeX document (via MikTeX-WinEdt). And, I've just upgraded to R