search for: fieldplots

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2011 Oct 20
2
identifying groups in xyplot
There have been posts in the past regarding similar questions, but many of them looked dated. I am using xyplot to show variability within my replicates, and so far so good, but I would like to refine the plot. I've used the code below to graph my response variable against year (coded as a factor with three levels 2009, 2010, 2011). Each replicate is in a different panel (|field). My group