* ==================================================================
* FILE:  	mixed006 multiple regression.sps .
* NOTES:  	Use MIXED procedure to perform multiple regression .
* DATE:  	29-Mar-2006 .
* AUTHOR:  	Bruce Weaver, bweaver@lakeheadu.ca .
* ================================================================== .

* Use the general social survey data file .

define !spss ()'C:\Program Files\SPSS\'!enddefine.

get file = !spss + '1991 U.S. General Social Survey.sav' .

* Perform simple linear regression with REGRESSION,
* UNIANOVA, and MIXED .

* Use the /TEST subcommand so that there are separate
* F-tests for the two variables in the ANOVA summary table.

REGRESSION
  /STATISTICS COEFF OUTS CI R ANOVA
  /DEPENDENT prestg80
  /METHOD=TEST (age) (educ)  .

UNIANOVA
  prestg80  WITH age educ
  /METHOD = SSTYPE(3)
  /PRINT = PARAMETER
  /DESIGN = age educ .

MIXED
  prestg80  WITH age educ
  /FIXED = age educ | SSTYPE(3)
  /print = solution
.

* ------ Now add an interaction term ------------ .

compute AGExED = age*educ.
exe.

REGRESSION
  /STATISTICS COEFF OUTS CI R ANOVA
  /DEPENDENT prestg80
  /METHOD=TEST (age) (educ) (AGExED) .

UNIANOVA
  prestg80  WITH age educ
  /METHOD = SSTYPE(3)
  /PRINT = PARAMETER
  /DESIGN = age educ age*educ.

MIXED
  prestg80  WITH age educ
  /FIXED = age educ age*educ | SSTYPE(3)
  /print = solution
.

* ================================================================== .