I'm not seeing how to plot the quantities associated with two values of a factor by reading the ?xyplot help page and Deepayan's book. Perhaps I need to generate many different subsets from the data frame, but that would require _many_ new data frames.
The structure of the data frame (for a single stream) has sites (factor), a date (as.Date), parameters (factor), and quantities (numeric). What I need to do is produce scatter plots of the quantities associated with two different parameters conditioned by site or by date (separate plots, I'm sure). I have 24 streams and initially need to look at the relationships of 5 different pairs of parameters (e.g., "Cond" and "TDS") for all sites and by sites. Can I do this from the existing data frame? It seems to me that a splom() could be ideal for this, but I still have the question of how to specify quantities for two parameters to plot against each other. Rich ______________________________________________ [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 and provide commented, minimal, self-contained, reproducible code.
