Sometimes it is useful to output the results of a regression
analysis to a data file for further analyses.  To do this in SPSS, 
you can use the output subcommand of the regression command. 
You have two choices of what to save using this subcommand:  you can save
the covariance matrix of the coefficients (with the covb option) or you
can save the correlation matrix of the coefficients (with the covr
option).  Let us use a data set called hsb2 as an
example.  We will save the results and the covariance matrix of the
coefficients in a file called out1.sav.

get file 'd:https://stats.idre.ucla.edu/wp-content/uploads/2016/02/hsb2-2.sav'.
regression
 /dep = write
 /method = enter read female
 /outfile = covb('d:out1.sav').

get file 'd:out1.sav'.
list.

DEPVAR_  ROWTYPE_ VARNAME_   CONST_     READ   FEMALE

WRITE    COV      CONST_       7.36     -.13     -.70
WRITE    COV      READ         -.13      .00      .00
WRITE    COV      FEMALE       -.70      .00     1.03
WRITE    EST                  20.23      .57     5.49
WRITE    SE                    2.71      .05     1.01
WRITE    SIG                    .00      .00      .00
WRITE    DFE                 197.00   197.00   197.00

Number of cases read:  7    Number of cases listed:  7

As you can see above, the covariances between the estimates have been saved to
this file, as well as the estimates, their standard errors, the significance and
the error degrees of freedom.  Note that the precision of the values saved
in out1.sav is greater than the two decimal places shown here.  Two decimal
places are shown because that is the default number of decimal places to display
in an SPSS data set.  You can easily increase the number of decimal places
shown by going to the “Variable View” of the SPSS Data Editor and increasing the
value in the column labeled “Decimals” (you may have to increase the column
width first).

Now let’s run the same regression and this time use the corb option
instead.

get file 'd:https://stats.idre.ucla.edu/wp-content/uploads/2016/02/hsb2-2.sav'.
regression
 /dep = write
 /method = enter read female
 /outfile = corb('d:out2.sav').

get file 'd:out2.sav'.
list.

DEPVAR_  ROWTYPE_ VARNAME_   CONST_     READ   FEMALE

WRITE    COR      CONST_       1.00     -.96     -.25
WRITE    COR      READ         -.96     1.00      .05
WRITE    COR      FEMALE       -.25      .05     1.00
WRITE    EST                  20.23      .57     5.49
WRITE    SE                    2.71      .05     1.01
WRITE    SIG                    .00      .00      .00
WRITE    DFE                 197.00   197.00   197.00

Number of cases read:  7    Number of cases listed:  7

As we can see, the correlations between the coefficients have been saved to
the data set, as well as the estimates, their standard errors, the
significance and the error degrees of freedom.

Results can also be saved into data sets using the Output Management System
(OMS).  For more information on how to use OMS to output results to data
sets, please see How can I output my results to a data file in
SPSS? .