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st: Symbolic differentiation


From   John Bates <lirac271@yahoo.com>
To   Stata <statalist@hsphsun2.harvard.edu>
Subject   st: Symbolic differentiation
Date   Tue, 28 Jul 2009 11:33:34 -0700 (PDT)

Is there any way to do symbolic differentiation in Stata or Mata?  i.e., deriv(x^2)=2x?

Related to this question: suppose I regress y on x and z and want to estimate the variance of x_hat/z_hat.  Are there any commands that let you calculate the variance of this expression automatically?  (I'd like to avoid calculating the first-order taylor expansion etc. myself, especially for more complicated expressions).



      

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