APPENDIX IV
 NORMAL EQUATIONS USED IN ESTIMATING THE REGRESSION, STORE, WEEK AND AGE CONSTANTS FOR THE FINAL MODEL.

 B 6; S6 86 J 6 B B66 6 | 6; 6o 10, | ; ~

 90 9 9 9 9 9 9 9 9 9 9 40 30 20
 9 9 0 0 0 0 0 0 0 0 0 4 3 2
 9 0 9 0 0 0 0 0 0 0 0 4 3 2
 9 0 0 9 0 0 0 0 0 0 0 4 3 2
 9 0 0 0 9 0 0 0 0 0 0 4 3 2
 9 0 0 0 0 9 0 0 0 0 0 4 3 2
 9 0 0 0 0 0 9 0 0 0 0 4 3 2
 9 0 0 0 0 0 0 9 0 0 0 4 3 2
 9 0 0 0 0 0 0 0 9 0 0 4 3 2
 9 0 0 0 0 0 0 0 0 9 0 4 3 2
 9 0 0 0 0 0 0 0 0 0 9 4 3 2
 40 4 4 4 4 4 4 4 4 4 4 40 0 0
 30 3 3 3 33 3 33 3 3 3 0 30 0
 20 2 2 2 2 2 2 2 2 2 0 0 20
 10 1 1 1 1 1 1 1 1 1 1 10 0 0
 10 1 1 1 1 1 1 1 1 1 1 10 0 0
 10 1 1 1 1 1 1 1 1 1 1 0 10 0
 10 1 1 1 1 1 1 1 1 0 0 10
 10 1 1 1 1 1 1 1 1 1 1 10 0 0
 10 1 1 1 1 1 1 1 1 1 1 0 10 0
 10 1 1 1 1 1 10 0 0
 10 1 1 1 1 1 1 1 1 1 1 0 10 0
 10 1 1 1 1 1 1 1 1 1 1 0 0 10
 -1 0 000 0 0 0 0 0 0 010 -1 0 0
 -1 0 0 0 0 0 0 0 0 -1 0-10 0
 103.84644 10.37595 10.69587 10.36845 10.97868 10.69587 9.504271 10.97868 10.36845 10.37595 9.5042 46.79028 34.61548 22.44068
 121.11480 12.20031 12.72651 12.022051 13.44180 12.72651 10.16673 13.44180 12.02205 12.20031 10.16673 55.19420 40.37160 25.54900
________ ____ I I I I I ____ ________