[R] abline with xyplot does not work

I am trying to plot the results of a random effects model where each subject is allowed to have his, or her, own intercept. I use xyplot to plot the data, lme to compute the regression and then try to put a summary regression line on the xyplot. As can be seen by the output pasted below, I am

Re: [R] abline with xyplot does not work

?panel.abline You need grid/lattice functions for xyplot ! -- Bert On Thu, Mar 29, 2012 at 9:38 AM, John Sorkin jsor...@grecc.umaryland.edu wrote: I am trying to plot the results of a random effects model where each subject is allowed to have his, or her, own intercept. I use xyplot to plot