RAT 6.1: Robust Against Trends Program
(c) 2009 Design Computing (designcomputing.net/)

Note: Best design for m=3, p=8 and n=15.

try #     	1
seed      	1230957639406
# of iterations	6
f         	0
det       	8.6282822E8
std. det  	0.33666214
TF        	1

Factor levels (columns 2-4):

-1	1	-1	1	
-0.8571	-1	-1	1	
-0.7143	1	1	-1	
-0.5714	-1	1	1	
-0.4286	1	-1	-1	
-0.2857	-1	-1	-1	
-0.1429	-1	1	-1	
0	1	1	1	
0.1429	-1	1	-1	
0.2857	-1	-1	-1	
0.4286	1	-1	-1	
0.5714	-1	1	1	
0.7143	1	1	-1	
0.8571	-1	-1	1	
1	1	-1	1	

X'X

5.7143	-0	0	-0	-0	-0	0	-0	
	15	-1	-1	-1	-1	-1	-1	
		15	-1	-1	-1	-1	-1	
			15	-1	-1	-1	-1	
				15	-1	-1	-1	
					15	-1	-1	
						15	-1	
							15	

inverse(X'X)

0.175	0	-0	0	0	0	-0	0	
	0.0694	0.0069	0.0069	0.0069	0.0069	0.0069	0.0069	
		0.0694	0.0069	0.0069	0.0069	0.0069	0.0069	
			0.0694	0.0069	0.0069	0.0069	0.0069	
				0.0694	0.0069	0.0069	0.0069	
					0.0694	0.0069	0.0069	
						0.0694	0.0069	
							0.0694	

Note: RAT used 0.016 seconds.