# st: AW: AW: Creating a variable taking the value of elasticity

 From "Martin Weiss" <[email protected]> To <[email protected]> Subject st: AW: AW: Creating a variable taking the value of elasticity Date Tue, 8 Sep 2009 16:07:38 +0200

```<>

Better example:

*************
vers 10.1

sysuse auto, clear
reg mpg length turn

mfx, eyex

mat A= e(Xmfx_eyex)
gen mymargeffect= A[1,1]
l mymargeffect in 1/10, noo
*************

HTH
Martin

-----Ursprüngliche Nachricht-----
Von: [email protected]
[mailto:[email protected]] Im Auftrag von Martin Weiss
Gesendet: Dienstag, 8. September 2009 16:03
An: [email protected]
Betreff: st: AW: Creating a variable taking the value of elasticity

<>

To capture the marginal effect in a variable,

*************
vers 10.1

sysuse auto, clear
reg mpg length turn

mfx

mat A= e(Xmfx_dydx)
gen mymargeffect= A[1,1]
l mymargeffect in 1/10, noo
*************

HTH
Martin

-----Ursprüngliche Nachricht-----
Von: [email protected]
[mailto:[email protected]] Im Auftrag von Dorothy Bridges
Gesendet: Dienstag, 8. September 2009 15:55
An: [email protected]
Betreff: st: Creating a variable taking the value of elasticity

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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```