/* -------------------------------------------------------------
	FILE: multreg.ooutlier

	DATA: Fabricated data on a class of students: test scores,
		homework scores, and final examination scores for a
		class of 15 students. The goal is to predict final
		exam score form previous test scores and homework.

	PURPOSE: The goal is to predict final
		exam score form previous test scores and homework.

   ------------------------------------------------------------- */


OPTIONS NOCENTER NODATE PAGE=1 LINESIZE=80;
TITLE 'Example of an outlier in PROC REG';
DATA MULTREG2;
   INPUT TESTS HOMEWORK FINAL;
CARDS;
70   6.6   64
82   8.1   84
61   5.0   53
89   8.9   87
76   6.4   74
84   9.0   90
83   7.4   78
79   7.7   83
94   8.8   84
91   5.2   91
85   8.7   89
90   9.6   92
;
PROC REG SIMPLE CORR;
   MODEL FINAL=HOMEWORK TESTS
         / COLLINOINT STB VIF TOL INFLUENCE;
*
*   COLLINOINT = Collinearity diagnostics
*   VIF = variance inflation factor
*   TOL = tolerance
*   INFLUENCE = various indices for the influence of each
*               observation for the regression model.
*;
RUN;
  REWEIGHT OBS.=10;
  REFIT;
  MODEL FINAL=HOMEWORK TESTS
        / COLLINOINT STB VIF TOL INFLUENCE;
RUN;