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help for ^_pemarg^
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    ^_pemarg^

^_pemarg^ computes marginal effects for some regression models.  ^_pemarg^ 
takes as its input the contents of the PE_base matrix created by ^_pebase^.  
^_pemarg^ returns the marginal effects in r() class matrix r(marginal)

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Authors: J. Scott Long and Jeremy Freese
         www.indiana.edu/~jslsoc/spost.htm
         spostsup@@indiana.edu
         