saving logistic regression output as .dta file

[Joe Ward]

Dear Statalist

I would like to save the output (odds ratio, ci, pval, se) of a simple logistic regression as a .dta file. I have tried using statsby, but cant work out how to save the output as odds ratios. I can view the output using r(table) - but cant work out how to save them as a .dta file. Any help would be much appreciated

Best Wishes

Joe

[Andrew Musau]

Odds ratios are just exponentiated (log odds) coefficients.

webuse lbw, clear
logistic low age smoke ht i.race
di _b[age]
di exp(_b[age])

Res.:

.
. logistic low age smoke ht i.race

Logistic regression                             Number of obs     =        189
                                                LR chi2(5)        =      19.48
                                                Prob > chi2       =     0.0016
Log likelihood = -107.59429                     Pseudo R2         =     0.0830

------------------------------------------------------------------------------
         low | Odds Ratio   Std. Err.      z    P>|z|     [95% Conf. Interval]
-------------+----------------------------------------------------------------
         age |   .9642515   .0328974    -1.07   0.286     .9018823    1.030934
       smoke |   3.043852   1.144877     2.96   0.003     1.456341     6.36186
          ht |   3.260856   2.025573     1.90   0.057     .9651256    11.01741
             |
        race |
      black  |   2.596016   1.297455     1.91   0.056     .9747382    6.913957
      other  |    2.91195   1.194677     2.61   0.009     1.303058    6.507347
             |
       _cons |    .344826   .3025262    -1.21   0.225     .0617754    1.924796
------------------------------------------------------------------------------
Note: _cons estimates baseline odds.

.
. di _b[age]
-.03640311

.
. di exp(_b[age])
.96425151

The derivation of the standard errors is not that much more difficult. See my example in #11 of the following link:
https://www.statalist.org/forums/for...ch-observation

I can view the output using r(table) - but cant work out how to save them as a .dta file.

You can save -r(table)- as a matrix and convert this to a dataset using svmat. See

help svmat