Generate Variable from Beta Coefficient

[Hans Schubert]

Hello,
After running a simple linear regression with just one independent variable, I request to have the beta coefficient reported.
This is fine and in this case comes back as beta .1651711
Is is possible to generate a variable where all observations will have this beta.
I have tried gen beta1=_b[OR_to_ORLTO_nmfp] - which is the independent variable in question. Whilst the beta1 var does generate, it does not report back the same beta as above.
Thanks

[Andrew Musau]

By "beta", do you mean a standardized coefficient reported by regress when adding the -beta- option? If so, Stata stores the raw coefficient. You can, however, pick this from the matrix -e(beta)-.

sysuse auto, clear
regress mpg weight disp, beta
mat l e(beta)
gen double wanted= e(beta)[1, "weight"]
sum wanted

Res.:

. regress mpg weight disp, beta

      Source |       SS           df       MS      Number of obs   =        74
-------------+----------------------------------   F(2, 71)        =     66.79
       Model |  1595.40969         2  797.704846   Prob > F        =    0.0000
    Residual |  848.049768        71  11.9443629   R-squared       =    0.6529
-------------+----------------------------------   Adj R-squared   =    0.6432
       Total |  2443.45946        73  33.4720474   Root MSE        =    3.4561

------------------------------------------------------------------------------
         mpg | Coefficient  Std. err.      t    P>|t|                     Beta
-------------+----------------------------------------------------------------
      weight |  -.0065671   .0011662    -5.63   0.000                -.8821898
displacement |   .0052808   .0098696     0.54   0.594                 .0838253
       _cons |   40.08452    2.02011    19.84   0.000                        .
------------------------------------------------------------------------------

. 
. mat l e(beta)

e(beta)[1,2]
          weight  displacement
r1    -.88218979     .08382533

. 
. gen double wanted= e(beta)[1, "weight"]

. 
. sum wanted

    Variable |        Obs        Mean    Std. dev.       Min        Max
-------------+---------------------------------------------------------
      wanted |         74   -.8821898           0  -.8821898  -.8821898

[Hans Schubert]

Thanks Andrew.
I'm getting 'matrix e(beta) not found' error when it reaches that line of the code

[George Ford]

works for me in v18.

did the model actually estimate?

maybe e(b) in older versions?

[Andrew Musau]

Refer to FAQ Advice #11:

11. What should I say about the version of Stata I use?

The current version of Stata is 18. Please specify if you are using an earlier version; otherwise, the answer to your question may refer to commands or features unavailable to you. Moreover, as bug fixes and new features are issued frequently by StataCorp, make sure that you update your Stata before posting a query, as your problem may already have been solved.

For workarounds in earlier versions of Stata, see https://www.statalist.org/forums/for...s-for-coefplot or even https://www.statalist.org/forums/for...a-coefficients.

[Hans Schubert]

I'm using Stata 17/ MP

[Hans Schubert]

Thanks got it now....installed esttab