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

 From Dorothy Bridges <[email protected]> To [email protected] Subject Re: st: AW: Creating a variable taking the value of elasticity Date Tue, 8 Sep 2009 10:06:03 -0400

```Perfect, thank you!  That worked.  Why is storage in a variable not
recommended?  I am doing this so that I can make a histogram comparing
the elasticities (coefficients) from a dozen different regressions.

On Tue, Sep 8, 2009 at 9:58 AM, Martin Weiss<[email protected]> wrote:
>
> <>
>
> Here is an example, although storage in a variable is not exactly
> recommended. Note the last line which shows you how to get the correct name
> for the coefficient...
>
>
> *************
> sysuse auto, clear
>
> gen logmpg=ln(mpg)
> gen loglength=log(len)
> gen logturn=log(turn)
>
> reg logmpg loglength logturn
> *store in variable
> gen mycoeff=_b[loglength]
>
> l mycoeff in 1/10, noo
>
> reg, coeflegend
> *************
>
>
>
> 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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```