Analysis of Variance with a Covariate
/****************************************************************/
/* S A S S A M P L E L I B R A R Y */
/* */
/* NAME: GLMCOV */
/* TITLE: Analysis of Variance with a Covariate */
/* PRODUCT: STAT */
/* SYSTEM: ALL */
/* KEYS: ANOVA GLM */
/* PROCS: GLM */
/* DATA: */
/* */
/* SUPPORT: NMM UPDATE: January 2010 */
/* REF: */
/* MISC: */
/* */
/****************************************************************/
data x;
input Trt Rep x y;
datalines;
1 1 35.2 116
1 2 43.2 226
1 3 65.6 2103
2 1 44.8 176
2 2 59.2 2811
2 3 48.0 387
20 1 54.4 2334
20 2 60.8 2530
20 3 49.6 1275
21 1 60.8 3197
21 2 59.2 3444
21 3 46.4 2414
24 1 72.0 3045
24 2 59.2 2206
24 3 19.2 540
25 1 76.8 3333
25 2 32.0 410
25 3 70.4 4294
;
proc glm;
classes trt rep;
model y=trt rep x trt*x;
run;