SOD 6.2: Second-order designs program
(c) 2010 Design Computing (designcomputing.net/)

Note: Best design for 4 factors in 40 runs.

try #     	103
seed      	2040245657
# of iterations	20
f         	15.36 (R)
det       	1.6415621E18
det*      	0.4095

Factor levels:

(1)	(2)	(3)	(4)	
-1	-1	0	-1	
-1	-1	-1	0	
-1	-1	0	1	
-1	-1	1	0	
1	-1	0	1	
1	-1	-1	0	
1	-1	0	-1	
1	-1	1	0	
-1	1	-1	1	
-1	1	1	1	
-1	1	1	-1	
-1	1	-1	-1	
1	1	1	-1	
1	1	1	1	
1	1	-1	1	
1	1	-1	-1	
-1	0	1	0	
-1	0	0	1	
-1	0	0	-1	
-1	0	-1	0	
1	0	0	-1	
1	0	-1	0	
1	0	0	1	
1	0	1	0	
0	-1	1	1	
0	-1	-1	-1	
0	-1	1	-1	
0	-1	-1	1	
0	1	0	0	
0	1	0	0	
0	1	0	0	
0	1	0	0	
0	0	-1	1	
0	0	1	-1	
0	0	-1	-1	
0	0	1	1	
0	0	0	0	
0	0	0	0	
0	0	0	0	
0	0	0	0	

X'X

40	24	24	24	24	0	0	0	0	0	0	0	0	0	0	
	24	16	16	16	0	0	0	0	0	0	0	0	0	0	
		24	16	16	0	0	0	0	0	0	0	0	0	0	
			24	16	0	0	0	0	0	0	0	0	0	0	
				24	0	0	0	0	0	0	0	0	0	0	
					24	0	0	0	0	0	0	0	0	0	
						24	0	0	0	0	0	0	0	0	
							24	0	0	0	0	0	0	0	
								24	0	0	0	0	0	0	
									16	0	0	0	0	0	
										16	0	0	0	0	
											16	0	0	0	
												16	0	0	
													16	0	
														16	

inverse(X'X)

0.125	-0.0417	-0.0417	-0.0417	-0.0417	0	0	0	0	0	0	0	0	0	-0	
	0.1111	-0.0139	-0.0139	-0.0139	0	0	0	0	0	0	0	0	0	-0	
		0.1111	-0.0139	-0.0139	0	0	0	0	0	0	0	0	0	-0	
			0.1111	-0.0139	0	0	0	0	0	0	0	0	0	-0	
				0.1111	0	0	0	0	0	0	0	0	0	-0	
					0.0417	0	0	0	0	0	0	0	0	-0	
						0.0417	0	0	0	0	0	0	0	-0	
							0.0417	0	0	0	0	0	0	-0	
								0.0417	0	0	0	0	0	-0	
									0.0625	0	0	0	0	-0	
										0.0625	0	0	0	-0	
											0.0625	0	0	-0	
												0.0625	0	-0	
													0.0625	-0	
														0.0625	

Note: Non-zero sums of squares contributing to f:
1122 (16)
1133 (16)
1144 (16)
2233 (16)
2244 (16)
3344 (16)

Note: The first 2 column(s) form the base design.
Note: SOD used 3.386 seconds.