When you have LSMeans effects in your model, it is often of interest to compare differences among their levels using Volcano Plots. Specify the set of differences that you want to consider.
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All Pairwise Differences denotes differences between all possible pairs of levels.
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Simple Differences denotes all differences for which only one level has changed.
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Differences with a Control denotes taking differences against a single reference level. You can specify this level in the next parameter (LSMeans Control Levels).
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Caution: All Pairwise Differences can generate numerous differences when there are many levels in your LSMeans effects.
