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# st: Creating a variable taking the value of elasticity

 From Dorothy Bridges To statalist@hsphsun2.harvard.edu Subject st: Creating a variable taking the value of elasticity Date Tue, 8 Sep 2009 09:55:14 -0400

```Dear Statalist,

I have a simple dataset containing two variables, x and y.  I regress
ln(y) on ln(x) and observe the coefficient on x as elasticity.  I then
want to create a variable taking the value of this coefficient.  How
would I do this?  Something like local elas=e(b); gen elas=`elas',
except e(b) contains all the coefficients, and I just want one.

A related question: when I regress y on x and then input "mfx, eyex,"
the ey/ex value is not the same as the coefficient I obtain using
regress ln(y) ln(x).  Why?  Also: how would I extract the ey/ex value
from the mfx output in order to create a variable taking that value?

Thank you,
Dorothy

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