Here's an example: > id <- c(17,17,17,18,18,18,19,19,19,20,20,20,21,21,21,22,22,22,23,23,23,24, > 24,24,25,25,25,26,26,26) > age <- rep(c(30,36,42),10) > outcome <- > c(12,17,10,5,5,2,NA,NA,NA,8,6,5,11,13,10,15,11,15,13,NA,9,0,0,0,20, > 14,16,1,2,2) > mydata <- as.data.frame(cbind(id,age,outcome)) > interaction.plot(mydata$age, mydata$id, mydata$outcome, fun = mean, legend > = FALSE, lty = 1, xtick = TRUE, type = "l") > > How can I make the 'mean' summary line red and thicker?
David Winsemius wrote: > > On Sep 7, 2011, at 4:49 PM, dadrivr wrote: > >> >> David Winsemius wrote: >>> What "mean summary line"? I count 8 lines and that matches the number >>> if id's with complete data. >> >> Yea, I don't know why there is no mean summary line showing up. I >> requested >> it in the interaction.plot statement (fun = mean), and I don't get any >> errors. > > You didn't get any errors and you _did_ get the means. It's just that > you only gave it a dataset that had only one value per category. The > mean is defined for a single element vector although the sd and var > are not. Look more closely at the example on the help page and you > will see that it has more than one value per category defined by the > two interaction variables Okay, I checked the example, and I see what you mean. Is there a way to compute an average trajectory (i.e., a line that represents the averages of all the other lines) and make that line red? Obviously, I'm fairly new to this in general, so any guidance would be helpful. -- View this message in context: http://r.789695.n4.nabble.com/Change-properties-of-line-summary-in-interaction-plot-tp3788614p3797431.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
