Statistical Analysis for Education and Psychology Researchers

Figure 8.20: Partitioning of sums of

squares in a 2×2 split-plot design

The data if collected in the usual way (one line per case with each repeated time
measurement on the same line) is first rearranged using a data step. For an explanation,
see under the heading Computer Analysis for the related ANOVA. PROC GLM is then
used to produce the ANOVA output see the following SAS code:

data a;

input subj sex t1 t2 t3;

cards;

1 1 5 8 6

2 1 4 8 6

3 1 3 5 5

4 1 6 10 9

5 1 3 6 5

6 0 6 5 7

7 0 4 4 4

8 0 5 6 5

9 0 4 5 5

10 0 3 4 5

;

data b; set a;

drop t1−t3;

time=1; score=t1; output;

time=2; score=t2; output;

time=3; score=t3; output;

proc glm data=b;

Statistical analysis for education and psychology researchers 340