SOD 8.0: Program for Constructing 3-level and Mixed-level Second-Order Designs
(c) 2015 Design Computing (http://designcomputing.net/)

Note: Best design for 4 factors in 16 runs.

Try	iter	A1	A2	A3	det*	det
1	2	0	64	82.38	0.3077	2.4159E10

Plan for try 1 using seed 1442924734036:

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

X'X

16	10	10	10	10	0	0	0	0	0	0	0	0	0	0	
	10	8	8	8	0	0	0	0	0	0	0	0	0	0	
		10	8	8	0	0	0	0	0	0	0	0	0	0	
			10	8	0	0	0	0	0	0	0	0	0	0	
				10	0	0	0	0	0	0	0	0	0	0	
					10	0	0	0	0	0	0	0	-8	0	
						10	0	0	0	0	-8	0	0	0	
							10	0	0	0	0	0	0	0	
								10	-8	0	0	0	0	0	
									8	0	0	0	0	0	
										8	0	0	0	0	
											8	0	0	0	
												8	0	0	
													8	0	
														8	


inverse(X'X)

0.2361	-0.0694	-0.0694	-0.0694	-0.0694	0	0	0	0	0	0	0	0	0	-0	
	0.4028	-0.0972	-0.0972	-0.0972	0	0	0	0	0	0	0	0	0	-0	
		0.4028	-0.0972	-0.0972	0	0	0	0	0	0	0	0	0	-0	
			0.4028	-0.0972	0	0	0	0	0	0	0	0	0	-0	
				0.4028	0	0	0	0	0	0	0	0	0	-0	
					0.5	0	0	0	0	0	0	0	0.5	-0	
						0.5	0	0	0	0	0.5	0	0	-0	
							0.1	0	0	0	0	0	0	-0	
								0.5	0.5	0	0	0	0	-0	
									0.625	0	0	0	0	-0	
										0.125	0	0	0	-0	
											0.625	0	0	-0	
												0.125	0	-0	
													0.625	-0	
														0.125	

Note: Non-zero elements in J:
124 (-8)
1122 (8)
1133 (8)
1144 (8)
2233 (8)
2244 (8)
3344 (8)

Note: The first 8 run(s) form the base design.
Note: SOD used 0.016 seconds.