NOTE: Copyright (c) 1999-2001 by SAS Institute Inc., Cary, NC, USA.
NOTE: SAS (r) Proprietary Software Release 8.2 (TS2M0)
      Licensed to NORTH DAKOTA UNIVERSITY SYSTEM-SYSTEMWIDE-INTERNAL, Site 0011524002.
NOTE: This session is executing on the WIN_PRO  platform.



NOTE: SAS initialization used:
      real time           2.52 seconds
      cpu time            0.71 seconds

1    options pageno=1;
2    data reg;
3    input x rep y;
4    xy=x*y;
5    datalines;

NOTE: The data set WORK.REG has 12 observations and 4 variables.
NOTE: DATA statement used:
      real time           0.64 seconds
      cpu time            0.03 seconds


18   ;;
19   proc print;
20   title 'Printout of Data -  All Data';
21   run;

NOTE: There were 12 observations read from the data set WORK.REG.
NOTE: PROCEDURE PRINT used:
      real time           0.97 seconds
      cpu time            0.03 seconds


22   proc reg;
23   model y=x;
24   title 'Regression on All Data - Reps Kept Separate';
25   run;

NOTE: 12 observations read.
NOTE: 12 observations used in computations.

NOTE: PROCEDURE REG used:
      real time           0.55 seconds
      cpu time            0.04 seconds


26   proc sort;
27   by x;

NOTE: There were 12 observations read from the data set WORK.REG.
NOTE: The data set WORK.REG has 12 observations and 4 variables.
NOTE: PROCEDURE SORT used:
      real time           0.08 seconds
      cpu time            0.00 seconds


28   proc means mean noprint;
29   by x;
30   var y;
31   output out=new mean=meany;
32   *Comment:  The previous statement takes the average of Y1 and Y2 to create

33   a new variable Y.  Performing regression on means provides a better
34   coefficient of determination';
35   run;

NOTE: There were 12 observations read from the data set WORK.REG.
NOTE: The data set WORK.NEW has 6 observations and 4 variables.
NOTE: PROCEDURE MEANS used:
      real time           0.18 seconds
      cpu time            0.03 seconds


36   proc reg;
37   model meany=x;
38   title 'Regression on the Mean of Y';
39   run;

WARNING: The variable _NAME_ or _TYPE_ exists in a data set that is not TYPE=CORR, COV, SSCP,
         etc.
NOTE: 6 observations read.
NOTE: 6 observations used in computations.