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

Note: Best design for 4 factors in 27 runs.

try #     	2
seed      	-1359979358
# of iterations	17
f         	10.67 (R)
det       	3.1310312E12
det*      	0.2522

Factor levels:

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

X'X

27	12	12	12	12	0	0	0	0	0	0	0	0	0	0	
	12	4	4	4	0	0	0	0	0	0	0	0	0	0	
		12	4	4	0	0	0	0	0	0	0	0	0	0	
			12	4	0	0	0	0	0	0	0	0	0	0	
				12	0	0	0	0	0	0	0	0	0	0	
					12	0	0	0	0	0	0	0	0	0	
						12	0	0	0	0	0	0	0	0	
							12	0	0	0	0	0	0	0	
								12	0	0	0	0	0	0	
									4	0	0	0	0	0	
										4	0	0	0	0	
											4	0	0	0	
												4	0	0	
													4	0	
														4	

inverse(X'X)

0.3333	-0.1667	-0.1667	-0.1667	-0.1667	0	0	0	0	0	0	0	0	0	-0	
	0.1875	0.0625	0.0625	0.0625	0	0	0	0	0	0	0	0	0	-0	
		0.1875	0.0625	0.0625	0	0	0	0	0	0	0	0	0	-0	
			0.1875	0.0625	0	0	0	0	0	0	0	0	0	-0	
				0.1875	0	0	0	0	0	0	0	0	0	-0	
					0.0833	0	0	0	0	0	0	0	0	-0	
						0.0833	0	0	0	0	0	0	0	-0	
							0.0833	0	0	0	0	0	0	-0	
								0.0833	0	0	0	0	0	-0	
									0.25	0	0	0	0	-0	
										0.25	0	0	0	-0	
											0.25	0	0	-0	
												0.25	0	-0	
													0.25	-0	
														0.25	

Note: Non-zero sums of squares contributing to f:
1122 (4)
1133 (4)
1144 (4)
2233 (4)
2244 (4)
3344 (4)

Note: SOD used 0.055 seconds.