Prof. Richard Williams (Notre Dame) put together an exceedingly helpful "primer" on Stata's "margins" command. Prof. WIlliam's PowerPoint slide deck (here) walks readers through the basics, provides helpful explanations, and illustrates though an array of concrete examples. As marginal effects gain in popularity many might find this helpful.
UPDATE: A loyal Els Blog reader, Prof. Jeff Yates (Binghamton), alerted me to two addition helpful links germane to margins (here and here).
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