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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

Hi, This is not an R question, but I've seen opinions given on non R topics, so I wanted to give it a try. :) How would one treat a variable that was measured once, but is known to fluctuate a lot? For example, I want to include a hormone in my regression as an explanatory variable. However, this hormone varies in its levels throughout a day. Nevertheless, its levels differ substantially