FRAC 6.1: Construct fractional factorial designs
(c) 2009 Design Computing (designcomputing.net/)

Note: Best design for m=4, p=14, and n=24.

try #     	6
seed      	-2037424666
# of iterations	7
f         	5.33 (0)
clear 2fi's	6
det       	2.1374506E15
det*      	0.5185
std. det  	1.0161052E-4
trace V   	1.5

Factor levels:

-1	1	-1	0	
-1	1	0	1	
-1	1	0	-1	
-1	1	1	0	
-1	-1	0	1	
-1	-1	1	0	
-1	-1	-1	0	
-1	-1	0	-1	
-1	0	1	1	
-1	0	-1	-1	
-1	0	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	1	
1	0	0	0	
1	0	0	0	
1	0	0	0	
1	0	0	0	

X'X

24	16	16	16	0	0	0	0	0	0	0	0	0	0	
	16	12	12	0	0	0	0	0	0	0	0	0	0	
		16	12	0	0	0	0	0	0	0	0	0	0	
			16	0	0	0	0	0	0	0	0	0	0	
				24	0	0	0	0	0	0	0	0	0	
					16	0	0	0	0	0	0	0	0	
						16	0	0	0	0	0	0	0	
							16	0	0	0	0	0	0	
								16	0	0	0	0	0	
									16	0	0	0	0	
										16	0	0	0	
											12	0	0	
												12	0	
													12	

inverse(X'X)

0.2083	-0.0833	-0.0833	-0.0833	0	0	0	0	0	0	0	0	0	-0	
	0.2083	-0.0417	-0.0417	0	0	0	0	0	0	0	0	0	-0	
		0.2083	-0.0417	0	0	0	0	0	0	0	0	0	-0	
			0.2083	0	0	0	0	0	0	0	0	0	-0	
				0.0417	0	0	0	0	0	0	0	0	-0	
					0.0625	0	0	0	0	0	0	0	-0	
						0.0625	0	0	0	0	0	0	-0	
							0.0625	0	0	0	0	0	-0	
								0.0625	0	0	0	0	-0	
									0.0625	0	0	0	-0	
										0.0625	0	0	-0	
											0.0833	0	-0	
												0.0833	-0	
													0.0833	

Note: Clear 2fi's: 12 13 14 23 24 34.
Note: The first 2 columns of the design form the base design.
Note: FRAC used 0.235 seconds.